A chip packaging structure and packaging method thereof

Abstract

The present invention discloses a chip packaging structure and a packaging method thereof, belonging to the technical field of semiconductor packaging. A chip unit body (10) of the first plastic packaging body is provided with a chip electrode (113), a passivation layer I (210), and an insulating layer I (310), a metal connector I is provided in an opening (311) of the insulating layer I, the plastic packaging material I (510) plastic-seales the metal connector I, the plastic packaging material II (610) covers the first plastic packaging body and the rewiring metal layer (710) above it to form a second plastic packaging body, and a passivation layer II (810) and a metal connector II (900) are provided above the second plastic packaging body. The present invention can effectively protect the front side of the chip and improve the reliability of the product.

Description

Technical Field

[0001] The invention relates to a chip packaging structure and a packaging method thereof, belonging to the technical field of semiconductor chip packaging. Background Art

[0002] Currently common fan-out packaging products, such as Figure 1 As shown, it includes a chip unit body 100 with an active surface, the active surface of the chip unit body 100 is provided with a chip electrode 101, the active surface of the chip unit body 100 and the upper surface of the chip electrode 101 are provided with a protective layer 200, the protective layer 200 has a protective layer opening above the chip electrode 101, a metal bump 300 is arranged in the protective layer opening, and the metal bump 300 is connected to the chip electrode 101 through the protective layer opening; the back side of the chip unit body 100 is provided with a back side protective layer 600. At present, the protection of the front side of the chip packaging product is weak, and the chip function failure problem is easy to occur when the front side of the chip is subjected to a large force. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the existing packaging technology and provide a chip packaging structure with a protected chip front side and a packaging method thereof.

[0004] The object of the present invention is achieved in that:

[0005] The present invention provides a chip packaging structure, which includes a first plastic package body, a plastic package material II, a rewiring metal layer, a passivation layer II and a metal connector II.

[0006] The first plastic package body comprises a chip unit body having an active surface and a plastic package material I, the active surface of the chip unit body is provided with a chip electrode, the active surface of the chip unit body and the upper surface of the chip electrode are provided with a passivation layer I and a passivation layer I opening, an insulating layer I and an insulating layer I opening are provided in the passivation layer I opening, the insulating layer I opening exposes the upper surface of the chip electrode, a metal connector I is provided in the insulating layer I opening, the metal connector I is connected to the chip electrode through the insulating layer I opening, the plastic package material I plastic-packages the metal connector I, and its upper surface is flush with the upper surface of the metal connector I;

[0007] The rewiring metal layer is arranged above the first plastic package body, the rewiring metal layer includes several metal layers and an insulating filling layer, the upper and lower adjacent metal layers are selectively connected, the insulating filling layer is arranged between the metal layers, the lowermost starting layer of the rewiring metal layer is provided with a lower pad, and the uppermost stopping layer is provided with an upper pad, the lower pad and the upper pad are both exposed from the insulating filling layer, wherein the lower pad is connected to the upper surface of the metal connector I of the first plastic package body;

[0008] The plastic encapsulation material II covers the periphery and back of the first plastic encapsulation body and the periphery of the rewiring metal layer to form a second plastic encapsulation body, the upper surface of which is flush with the upper surface of the rewiring metal layer;

[0009] A passivation layer II and an opening of the passivation layer II are provided above the second plastic package, and the opening of the passivation layer II exposes an upper pad of the rewiring metal layer;

[0010] A metal connector II is disposed above the passivation layer II, and the metal connector II is connected to an upper pad of the rewiring metal layer.

[0011] Optionally, the metal connector I is provided with an adhesion barrier layer, a metal seed layer I and a metal bump in sequence from bottom to top, and the adhesion barrier layer is a composite layer composed of one or two layers of material.

[0012] Optionally, the cross-sectional shape of the metal bump includes but is not limited to a rectangle, a circle or an ellipse.

[0013] Optionally, the metal seed layer I and the metal bump are an integrated structure.

[0014] Optionally, the metal connector II includes an adhesion layer, a metal seed layer II, a metal column and a solder ball in order from bottom to top.

[0015] Optionally, the metal seed layer II and the metal column are an integrated structure, and the cross-sectional shape of the metal column includes but is not limited to a rectangle, a circle or an ellipse.

[0016] The present invention also provides a packaging method for a chip packaging structure, and the process steps are as follows:

[0017] Step 1, taking an integrated circuit wafer, the upper surface of which is provided with a chip electrode and a passivation layer I, the chip electrode realizes electrical communication within the integrated circuit wafer and partially exposes the opening of the passivation layer I to form an input / output terminal of the chip electrode;

[0018] Step 2: An insulating layer I and an opening in the insulating layer I and a scribe line are provided on the passivation layer I by photolithography, wherein the opening in the insulating layer I exposes the input / output end of the chip electrode, and the scribe line is vertically interlaced in the horizontal and vertical directions, and the integrated circuit wafer is pre-divided into a plurality of chip unit bodies arranged in an array;

[0019] Step 3: an adhesion barrier layer is disposed in the opening of the insulating layer I by sputtering; and a metal seed layer I and a metal bump are disposed on the adhesion barrier layer in sequence by sputtering, photolithography, electroplating, degumming and etching methods;

[0020] Step 4: on the insulating layer I, the adhesion barrier layer, the metal seed layer I and the metal bump are firstly plastic-sealed with a plastic sealing material I to form a first plastic-sealed body;

[0021] Step 5: Remove excess plastic encapsulation material I on the surface of the wafer by grinding to expose the upper surface of the metal bump to form the input / output end of the metal column;

[0022] Step 6: a rewiring metal layer is arranged on the first plastic package body through a metal rewiring process, the rewiring metal layer includes a plurality of metal layers and an insulating filling layer, the upper and lower adjacent metal layers are selectively connected, the insulating filling layer is arranged on the metal layer to play an insulating protection role, the lower starting layer of the rewiring metal layer is arranged with a lower pad, and the upper termination layer is arranged with an upper pad, the lower pad and the upper pad are both exposed from the insulating layer, wherein the lower pad is connected to the upper surface of the metal connector I of the first plastic package body;

[0023] Step 7, thinning the back side of the wafer after the above packaging and cutting it into a plurality of chip monomers I with the front side protected;

[0024] Step 8: by means of a bonding method, the chip monomers I are placed upside down in a certain order on a carrier sheet with a temporary bonding film attached thereto;

[0025] Step nine, using plastic encapsulation material II to perform a second plastic encapsulation on the chip monomer I on the carrier to form a second plastic encapsulation body;

[0026] Step 10, removing the carrier and the temporary bonding film by a debonding method, exposing the upper pad set on the uppermost termination layer of the rewiring metal layer of the chip monomer I, and completing the reconstructed wafer;

[0027] Step 11, by photolithography, a passivation layer II and an opening of the passivation layer II are provided on the second plastic package, wherein the opening of the passivation layer II exposes an upper pad of the rewiring metal layer;

[0028] Step 12, again by sputtering, an adhesion layer is provided in the opening of the passivation layer II; then by sputtering, photolithography, electroplating, degumming and etching methods, metal connectors II are provided on the adhesion layer in sequence, and the metal connectors II include metal seed layer II, metal pillars and solder balls in sequence from bottom to top,

[0029] Step 13: Cut the plastic package into a plurality of chip packaging units by dicing.

[0030] Furthermore, in step three, the metal bump is formed by chemical plating.

[0031] Furthermore, in step seven, the bonding method is to coat or press a temporary bonding film on the surface of the carrier, and then bond it to the front side of the first plastic package under the action of pressure, temperature and vacuum.

[0032] Furthermore, steps 4 to 5 also include the following processes: in step 4, for the chip monomer I with an alignment mark in the wafer, an alignment mark protection block is set at the original alignment mark on the front side of the chip monomer I, and then the alignment mark protection block, the adhesion barrier layer, the metal seed layer I and the metal bump are plastic-sealed for the first time with a plastic packaging material I to form a first plastic packaging body; in step 5, when a grinding process is performed to remove excess plastic packaging material I on the surface of the wafer, the alignment mark protection block is exposed while the upper surface of the metal bump is exposed.

[0033] Furthermore, in step six, for the chip monomer I with the alignment mark protection block, when setting the rewiring metal layer, the alignment mark protection block above the original alignment mark can be used for precise alignment.

[0034] Beneficial Effects

[0035] 1. The present invention first performs a first plastic sealing after completing the metal bump on the front side of the incoming wafer to form a first plastic sealing body, and exposes the upper surface of the metal bump to form an electrical connection surface; after completing the plastic sealing of the front side, a rewiring metal layer is arranged, and then the surroundings and the back side of the chip and the surroundings of the rewiring metal layer are plastic sealed to form a second plastic sealing body, and the wafer reconstruction after cutting is completed; through the two plastic sealings, a buffering effect is formed on the chip surface, which can effectively protect the chip front side, improve the mechanical strength and rigidity of the chip front side, reduce the damage to the chip surface due to the force of the solder ball, overcome the problem of chip fragments in the packaged finished product, and improve the reliability of the product;

[0036] 2. Since plastic encapsulation material (EMC) is set on both the front and back of the chip, the stress of the two offsets each other, which is beneficial to improve the warping problem of the product, and is conducive to the subsequent metal rewiring process, ball planting process, etc., reducing the process difficulty;

[0037] 3. The present invention effectively prevents the diffusion of metal atoms such as Cu by providing an adhesion barrier layer, and effectively avoids chip function failure caused by the diffusion of metal atoms;

[0038] 4. All processes of the present invention are completed on the incoming wafer 100 with good coplanarity, which improves the uniformity of metal exposure and is conducive to improving the yield;

[0039] 5. In the process of the present invention, by setting the alignment mark protection block 150, the plastic packaging material avoids blocking the original alignment mark 120, improves the alignment accuracy of the photolithography process in the metal rewiring process, and solves the photolithography offset problem caused by wafer reconstruction. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a schematic diagram of the traditional chip packaging structure;

[0041] Figure 2A schematic cross-sectional view of a chip packaging structure of the present invention;

[0042] Figures 3A to 3R A schematic flow chart of a packaging method for a chip packaging structure of the present invention;

[0043] In the figure:

[0044] Chip unit body 10

[0045] Chip electrode 113

[0046] Passivation layer Ⅰ210

[0047] Passivation layer I opening 213

[0048] Insulation layer Ⅰ310

[0049] Insulation layer I opening 311

[0050] Adhesion barrier layer 410

[0051] Metal Bump 430

[0052] Plastic packaging material Ⅰ510

[0053] Plastic packaging material Ⅱ610

[0054] Rewiring metal layer 710

[0055] Lower pad 713

[0056] Upper pad 715

[0057] Passivation layer II 810

[0058] Passivation layer II opening 813

[0059] Metal connector Ⅱ900

[0060] Adhesion layer 910

[0061] Metal column 920

[0062] Solder ball 950;

[0063] Wafer 100

[0064] Original alignment mark 120

[0065] Position mark protection block 150

[0066] Slide L1

[0067] Temporary bonding film L2. DETAILED DESCRIPTION

[0068] The specific implementation modes of the present invention are described in detail below with reference to the accompanying drawings. Example

[0069] The present invention provides a chip packaging structure, which includes a first plastic packaging body, a plastic packaging material II 610 , a rewiring metal layer 710 , a passivation layer II 810 and a metal connector II 900 .

[0070] The first plastic package body includes a chip unit body 10 with an active surface and a plastic package material I 510. The thickness of the chip unit body 10 is generally 25 to 150 microns. The active surface of the chip unit body 10 is provided with a chip electrode 113. The active surface of the chip unit body 10 and the upper surface of the chip electrode 113 are provided with a passivation layer I 210 and a passivation layer I opening 213. The passivation layer I opening 213 is provided with an insulating layer I 310 and an insulating layer I opening 311. The insulating layer I opening 311 exposes the upper surface of the chip electrode 113. The insulating layer I opening 311 is provided with a metal connector I. The metal connector I is connected to the chip electrode 113 through the insulating layer I opening 311. The metal connector I is provided with an adhesion barrier layer 410, a metal seed layer I and a metal bump 430 in sequence from bottom to top. The material of the metal seed layer I is Cu, Ni, etc., and the thickness of the metal seed layer I is 0.01 to 1 micron. The metal material of the metal bump 430 includes but is not limited to Ti, Cu, Ni, Sn, Au elements, and its cross-sectional shape includes but is not limited to rectangular, circular or elliptical. Preferably, the metal seed layer I and the metal bump 430 are an integral structure. The material of the adhesion barrier layer 410 is Cr, Ti, TiW, V, NiV, etc., and can be a composite layer composed of one or two layers of materials. The thickness of the adhesion barrier layer 410 is 0.1~3 microns. In addition to combining with the chip electrode 113, the adhesion barrier layer 410 also prevents the metal atoms or other metal particles of the metal seed layer I and the metal bump 430 from diffusing into the chip unit body 10.

[0071] The plastic encapsulation material I510 plastic encapsulates the metal connector I, and its upper surface is flush with the upper surface of the metal connector I; the material of the plastic encapsulation material I510 is a thermosetting polymer such as epoxy resin, phenolic resin, silica gel, amino, and unsaturated resin; in order to improve the heat dissipation capacity, the plastic encapsulation material I510 can be a composite material containing powders or fibers such as metal, ceramics, silicon oxide, and graphene.

[0072] The rewiring metal layer 710 is arranged above the first plastic package body, and the rewiring metal layer 710 includes a plurality of metal layers and an insulating filling layer, and the upper and lower adjacent metal layers are selectively connected, and the insulating filling layer is arranged between the metal layers, and the lower starting layer of the rewiring metal layer 710 is provided with a lower pad 713, and the upper termination layer is provided with an upper pad 715, and the lower pad 713 and the upper pad 715 are both exposed from the insulating filling layer, wherein the lower pad 713 is connected to the upper surface of the metal connector I of the first plastic package body;

[0073] The plastic encapsulation material II 610 covers the four sides and back side of the first plastic encapsulation body and the four sides of the rewiring metal layer 710 to form a second plastic encapsulation body, whose upper surface is flush with the upper surface of the rewiring metal layer 710; the material of the plastic encapsulation material II 610 is a thermosetting polymer such as epoxy resin, phenolic resin, silica gel, amino, and unsaturated resin; in order to improve the heat dissipation capacity, the plastic encapsulation material II 610 can be a composite material containing powders or fibers such as metal, ceramic, silicon oxide, and graphene.

[0074] A passivation layer II 810 and a passivation layer II opening 813 are disposed above the second plastic package, and the passivation layer II opening 813 exposes an upper pad 715 of the rewiring metal layer 710;

[0075] A metal connector II 900 is disposed above the passivation layer II 810, and the metal connector II 900 is connected to the upper pad 715 of the rewiring metal layer 710. The metal connector II 900 includes an adhesion layer 910, a metal seed layer II, a metal column 920 and a solder ball 950 from bottom to top. The material of the metal seed layer II is Cu, Ni, etc., and the thickness of the metal seed layer II is 0.01 to 1 micron. Usually, the metal seed layer II and the metal column 920 are an integral structure, and the height of the metal column 920 is usually 2 to 100 microns. The metal material of the metal column 920 is usually Cu, CuNi, CuNiAu, NiAu, etc., and its cross-sectional shape includes but is not limited to rectangular, circular or elliptical. The material of the adhesion layer 910 is Cr, Ti, TiW, V, NiV, etc., and can be a composite layer composed of one or two layers of material, and the thickness of the adhesion layer 910 is 0.01 to 2 microns. The adhesion layer 910 may function to be combined with the upper pad 715 of the rewiring metal layer 710 .

[0076] The present invention provides a packaging method for a chip packaging structure, and the process steps are as follows:

[0077] Step 1, such as Figure 3A As shown, an integrated circuit wafer 100 is taken, and a chip electrode 113 and a passivation layer I 210 are provided on its upper surface. The chip electrode 113 realizes electrical communication within the integrated circuit wafer 100 and partially exposes the opening 213 of the passivation layer I to form the input / output terminal of the chip electrode 113.

[0078] Step 2, such as Figure 3B As shown, an insulating layer I 310, an insulating layer I opening 311, and a scribe line 313 are provided on the passivation layer I 210 by photolithography. The insulating layer I opening 311 exposes the input / output end of the chip electrode 113. The scribe line 313 is vertically interlaced in the horizontal and vertical directions, and the integrated circuit wafer 100 is pre-divided into a plurality of chip unit bodies 10 arranged in an array.

[0079] Step three, such as Figure 3C As shown, an adhesion barrier layer 410 is disposed in the opening 311 of the insulating layer I by sputtering; the adhesion barrier layer 410 is made of Cr, Ti, TiW, V, NiV, etc., and may be a composite layer composed of one or two layers of material, and the thickness of the adhesion barrier layer 410 is 0.1 to 3 microns.

[0080] Then, a metal seed layer I and a metal bump 430 are sequentially arranged on the adhesion barrier layer 410 by sputtering, photolithography, electroplating, degumming and etching. The metal material of the metal bump 430 includes but is not limited to Ti, Cu, Ni, Sn, and Au elements. The metal bump 430 can also be formed by chemical plating. Its cross-sectional shape is designed according to actual needs, including but not limited to rectangular, circular or elliptical. The material of the metal seed layer I is Cu, Ni, etc., and the thickness of the metal seed layer I is 0.01 to 1 micron. Usually, the metal seed layer I and the metal bump 430 are an integrated structure; in addition to combining with the chip electrode 113, the adhesion barrier layer 410 also plays a role in preventing the metal atoms or other metal particles of the metal seed layer I and the metal bump 430 from diffusing into the wafer 100.

[0081] Step 4: Figure 3D As shown, above the insulating layer I310, the adhesion barrier layer 410, the metal seed layer I and the metal bump 430 are first plastic-sealed with a plastic packaging material I510 to form a first plastic packaging body, which realizes the front protection of the wafer 100; the material of the plastic packaging material I510 is a thermosetting polymer such as epoxy resin, phenolic resin, silica gel, amino, unsaturated resin; in order to improve the heat dissipation capacity, the plastic packaging material I510 can be a composite material containing metal, ceramic, silicon oxide, graphene and other powders or fibers.

[0082] Step 5: Figure 3E As shown, the excess plastic encapsulation material I 510 on the surface of the wafer 100 is removed by grinding, exposing the upper surface of the metal bump 430 to form the input / output end 431 of the metal column.

[0083] Step 6: Figure 3F As shown, through the metal rewiring process, a rewiring metal layer 710 is arranged above the first plastic package body, and the rewiring metal layer 710 includes several metal layers and an insulating filling layer. The upper and lower adjacent metal layers are selectively connected. The insulating filling layer is arranged on the metal layer to play an insulating protection role. The lower starting layer of the rewiring metal layer 710 is provided with a lower pad 713, and the upper ending layer is provided with an upper pad 715. The lower pad 713 and the upper pad 715 are both exposed from the insulating layer, wherein the lower pad 713 is connected to the upper surface of the metal connector Ⅰ of the first plastic package body.

[0084] Step 7: Figure 3GAs shown, the back side of the wafer 100 that has completed the above packaging is thinned and cut into a plurality of chip monomers I with protected front sides. The thickness of the chip unit body 10 formed after thinning is usually 25 to 150 microns. The thinning method can be mechanical thinning or chemical mechanical thinning.

[0085] Step 8: Figure 3H As shown, the chip monomers I are placed upside down in a certain order on a carrier L1 with a temporary bonding film L2. Preferably, the material of the temporary bonding film L2 is a thermoplastic liquid material, or a film material sensitive to UV light. The bonding method is usually to apply or press the temporary bonding film L2 on the surface of the carrier L1, and then bond it to the front side of the chip monomer I under the action of pressure, temperature, and vacuum.

[0086] Step nine, such as Fig. 3I As shown, the chip monomer I is plastic-sealed for the second time on the carrier L1 using plastic packaging material II 610 to form a second plastic packaging body; the material of the plastic packaging material II 610 is a thermosetting polymer such as epoxy resin, phenolic resin, silica gel, amino, and unsaturated resin; in order to improve the heat dissipation capacity, the plastic packaging material II 610 can be a composite material containing powders or fibers such as metal, ceramic, silicon oxide, and graphene.

[0087] Step 10: Figure 3J As shown, the carrier L1 and the temporary bonding film L2 are removed by a debonding method to expose the upper pad 715 set on the uppermost termination layer of the rewiring metal layer 710 of the chip monomer I, and the reconstructed wafer is completed. The process of reconstructing the wafer overcomes the problems of large warping and large thickness fluctuation of the chip packaging structure completed by the prior art, which reduces the process difficulty and is conducive to improving the product yield; the debonding method can be thermal debonding, chemical debonding, laser debonding or UV debonding, etc.

[0088] Step 11: Figure 3K As shown, a passivation layer II 810 and a passivation layer II opening 813 are disposed on the second plastic package body by photolithography, and the passivation layer II opening 813 exposes the upper pad 715 of the rewiring metal layer 710 .

[0089] Step 12: Figure 3L As shown, an adhesion layer 910 is disposed in the opening 813 of the passivation layer II by sputtering again; the adhesion layer 910 is made of Cr, Ti, TiW, V, NiV, etc., and may be a composite layer composed of one or two layers of material, and the thickness of the adhesion layer 910 is 0.01 to 2 microns.

[0090] Then, metal connector II 900 is sequentially arranged on the adhesion layer 910 by sputtering, photolithography, electroplating, degumming and etching methods. The metal connector II 900 includes metal seed layer II, metal pillar 920 and solder ball 950 from bottom to top. The metal material of metal pillar 920 is usually Cu, CuNi, CuNiAu, NiAu, etc. The metal pillar 920 can also be formed by chemical plating. The cross-sectional shape of metal pillar 920 is designed according to actual needs, including but not limited to rectangular, circular or elliptical.

[0091] The material of the metal seed layer II is Cu, Ni, etc., and the thickness of the metal seed layer II is 0.01-1 micrometer. Usually, the metal seed layer II and the metal pillar 920 are an integrated structure, and the height of the metal pillar 920 is usually 2-100 micrometers. The adhesion layer 910 can play a role in combining with the upper pad 715 of the rewiring metal layer 710.

[0092] Step 13: Figure 3M As shown, the plastic package is cut into a plurality of chip package units by scribing. The scribing can be performed using a blade containing diamond or ceramic particles, or laser cutting can be used.

[0093] The present invention provides a packaging method for a chip packaging structure, wherein steps 4 to 6 further include the following process: in step 4, since the plastic encapsulation material I 510 covers the front surface of the wafer 100, it will also cover the original alignment mark 120 originally set on the front surface of the wafer 100, such as Figure 3N Therefore, before the front surface of the wafer 100 is coated, the alignment mark needs to be protected. Through a dispensing process or a printing process, an alignment mark protection block 150 can be set at the original alignment mark 120 on the front surface of the wafer 100. The material of the alignment mark protection block 150 can be a transparent resin or metal, and its shape is not limited, but it can be clearly distinguished visually, such as Fig.3O and Figure 3P As shown, the alignment mark protection block 150, the adhesion barrier layer 410, the metal seed layer I and the metal bump 430 are firstly encapsulated with the encapsulation material I 510 to form a first encapsulation body, as shown in FIG. Figure 3Q As shown, the positioning mark protection block 150 can be set before the metal bump 430 is set, or it can be set after the metal bump 430 is set; in step five, when the grinding process is performed to remove the excess plastic packaging material I510 on the surface of the wafer 100, the positioning mark protection block 150 is exposed while the upper surface of the metal bump 430 is gradually exposed, as shown in FIG. Figure 3R As shown, the difficulty of the alignment process when setting the rewiring metal layer 710 in the subsequent step six is ​​reduced, and the alignment accuracy is improved.

[0094] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A chip packaging structure, characterized in that: The invention comprises a first plastic package, a plastic package II (610), a rewiring metal layer (710), a passivation layer II (810) and a metal connector II (900). The first plastic package comprises a chip unit body (10) having an active surface and a plastic package I (510). The active surface of the chip unit body (10) is provided with a chip electrode (113). The active surface of the chip unit body (10) and the upper surface of the chip electrode (113) are provided with a passivation layer I (210) and a passivation layer I opening (213). An insulating layer I (310) and an insulating layer I opening (311) are provided in the passivation layer I opening (213). The insulating layer I opening (311) exposes the chip. The upper surface of the electrode (113), a metal connector I is arranged in the opening (311) of the insulating layer I, the metal connector I is connected to the chip electrode (113) through the opening (311) of the insulating layer I, the plastic encapsulation material I (510) is located on the front of the chip unit body and plastic encapsulates the metal connector I, and its upper surface is flush with the upper surface of the metal connector I, the front of the chip unit body is provided with an alignment mark and an alignment mark protection block located on the alignment mark, the alignment mark protection block is made of a transparent resin or metal, the plastic encapsulation material I (510) plastic encapsulates the alignment mark protection block, and the plastic encapsulation material I (510) exposes the surface of the alignment mark protection block; The rewiring metal layer (710) is arranged above the first plastic package body, the rewiring metal layer (710) comprises a plurality of metal layers and an insulating filling layer, the upper and lower adjacent metal layers are selectively connected, the insulating filling layer is arranged between the metal layers, the lowermost starting layer of the rewiring metal layer (710) is provided with a lower pad (713), and the uppermost stopping layer is provided with an upper pad (715), the lower pad (713) and the upper pad (715) are both exposed from the insulating filling layer, wherein the lower pad (713) is connected to the upper surface of the metal connector I of the first plastic package body; The plastic encapsulation material II (610) covers the periphery and back side of the first plastic encapsulation body and the periphery of the rewiring metal layer (710) to form a second plastic encapsulation body, the upper surface of which is flush with the upper surface of the rewiring metal layer (710); A passivation layer II (810) and a passivation layer II opening (813) are provided above the second plastic package, and the passivation layer II opening (813) exposes an upper pad (715) of the rewiring metal layer (710); A metal connector II (900) is disposed above the passivation layer II (810), and the metal connector II (900) is connected to an upper pad (715) of the rewiring metal layer (710).

2. The packaging structure according to claim 1, characterized in that: The metal connector I is provided with an adhesion barrier layer (410), a metal seed layer I and a metal bump (430) in sequence from bottom to top, and the adhesion barrier layer (410) is a composite layer composed of one or two layers of material.

3. The packaging structure according to claim 2, characterized in that: The cross-sectional shape of the metal bump (430) is rectangular, circular or elliptical.

4. The packaging structure according to claim 2 or 3, characterized in that: The metal seed layer I and the metal bump (430) are an integrated structure.

5. The packaging structure according to claim 1, characterized in that: The metal connector II (900) comprises, from bottom to top, an adhesion layer (910), a metal seed layer II, a metal column (920) and a solder ball (950).

6. The packaging structure according to claim 5, characterized in that: The metal seed layer II and the metal column (920) are an integrated structure, and the cross-sectional shape of the metal column (920) is rectangular, circular or elliptical.

7. A packaging method for a chip packaging structure, the process steps are as follows: Step 1: Take an integrated circuit wafer (100), the upper surface of which is provided with a chip electrode (113) and a passivation layer I (210), the chip electrode (113) realizes electrical communication within the integrated circuit wafer (100) and partially exposes the opening (213) of the passivation layer I, thereby forming an input / output terminal of the chip electrode (113); Step 2: an insulating layer I (310), an insulating layer I opening (311), and a scribe line (313) are provided on the passivation layer I (210) by photolithography, wherein the insulating layer I opening (311) exposes the input / output end of the chip electrode (113), and the scribe line (313) is vertically interlaced in the horizontal and vertical directions, so as to pre-divide the integrated circuit wafer (100) into a plurality of chip unit bodies (10) arranged in an array; Step three, by sputtering, an adhesion barrier layer (410) is provided in the opening (311) of the insulating layer I; and then, by sputtering, photolithography, electroplating, degumming and etching methods, a metal seed layer I and a metal bump (430) are provided on the adhesion barrier layer (410) in sequence; Step 4: above the insulating layer I (310), on the front side of the chip unit body, the adhesion barrier layer (410), the metal seed layer I and the metal bump (430) are firstly plastic-sealed using a plastic sealing material I (510) to form a first plastic-sealed body; Step 5: removing excess plastic encapsulation material I (510) on the surface of the wafer (100) by grinding, exposing the upper surface of the metal bump (430), and forming the input / output end (431) of the metal column; Step six, through the metal rewiring process, a rewiring metal layer (710) is arranged above the first plastic package, the rewiring metal layer (710) includes a plurality of metal layers and an insulating filling layer, the upper and lower adjacent metal layers are selectively connected, the insulating filling layer is arranged on the metal layer, and plays an insulating protection role, the lower starting layer of the rewiring metal layer (710) is provided with a lower pad (713), and the upper end layer is provided with an upper pad (715), the lower pad (713) and the upper pad (715) are both exposed from the insulating layer, wherein the lower pad (713) is connected to the upper surface of the metal connector I of the first plastic package; Step 7, thinning the back side of the wafer (100) that has completed the packaging and cutting it into a plurality of chip monomers (I) with the front side protected; Step 8: placing the chip monomers (I) upside down in a certain order on a carrier (L1) with a temporary bonding film (L2) attached thereto by a bonding method; Step nine, using a plastic encapsulation material II (610) to perform a second plastic encapsulation on the chip unit (I) on the carrier (L1) to form a second plastic encapsulation body; Step ten, removing the carrier (L1) and the temporary bonding film (L2) by a debonding method, exposing the upper pad (715) provided on the uppermost termination layer of the rewiring metal layer (710) of the chip monomer (I), and completing the reconstructed wafer; Step 11: using a photolithography method, a passivation layer II (810) and a passivation layer II opening (813) are provided above the second plastic package, wherein the passivation layer II opening (813) exposes an upper pad (715) of the rewiring metal layer (710); Step twelve, again using a sputtering method to provide an adhesion layer (910) in the opening (813) of the passivation layer II; and then using sputtering, photolithography, electroplating, degumming and etching methods to sequentially provide metal connectors II (900) on the adhesion layer (910), wherein the metal connectors II (900) sequentially include a metal seed layer II, a metal column (920) and a solder ball (950) from bottom to top; Step 13, cutting the plastic package into a plurality of chip packaging units by dicing; In step 4 to step 5, the following process is also included: in step 4, for the chip monomer (I) with an alignment mark in the wafer (100), an alignment mark protection block (150) is respectively set at the original alignment mark (120) on the front side of the chip monomer (I), and then the alignment mark protection block (150), the adhesion barrier layer (410), the metal seed layer I and the metal bump (430) are firstly encapsulated with a plastic encapsulation material I (510) to form a first plastic encapsulation body; in step 5, when a grinding process is performed to remove excess plastic encapsulation material I (510) on the surface of the wafer (100), the alignment mark protection block (150) is exposed while the upper surface of the metal bump (430) is exposed.

8. The packaging method according to claim 7, characterized in that: In step three, the metal bump (430) is formed by chemical plating.

9. The packaging method according to claim 7, characterized in that: In step six, for the chip unit I having the alignment mark protection block (150), when setting the rewiring metal layer (710), the alignment mark protection block (150) above the original alignment mark (120) is used for precise alignment.

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