The invention provides a multi-layer co-
extrusion packaging material having high
moisture barrier and barrier properties and a preparation method of the multi-layer co-
extrusion packaging material; and the five-layer co-
extrusion packaging material disclosed by the invention comprises a
polyethylene layer having
high intensity and good
adaptation as the first layer, a
barrier layer as the second layer, an ultra-fine and ultra-strong water absorbent modified
polyethylene layer as the third layer, a
barrier layer as the fourth layer and a high-speed thermal sealing layer having excellent
chemical stability as the fifth layer, wherein various
layers are contacted with each other in sequence. In the multi-layer co-extrusion packaging material having high
moisture barrier and barrier properties disclosed by the invention, the ultra-fine and ultra-strong water absorbent modified
polyethylene layer has the strong function of absorbing
moisture; other
layers respectively have good barrier, thermal sealing and printable properties; in addition, by means of reasonable structural design and
material selection, various
layers have excellent packaging material having high
moisture barrier and barrier properties. The five-layer co-extrusion packaging material disclosed by the invention has excellent
moisture barrier property; simultaneously, other barrier properties (barrier of
oxygen,
nitrogen and the like) are also excellent; furthermore, the cost can be effectively reduced; and the
processing technique is simple.