The invention provides a multifunctional processing device for a printed circuit board. The device comprises a supporting base plate, a support screw lever, a rubber disc, a support column, a protective top plate, an adjustable solder paste storage bottle structure, a convenient-to-wipe adjustable magnifying lens structure, an adjustable circuit board processing support screen plate structure, a layered cooling placement frame structure, a convenient-to-connect flue gas absorption connection cylinder structure, a drawer groove, a drawer plate, a welding seat, a limiting stop cap and a screw rod column. Due to the arrangement of the solder paste storage bottle, a solder paste guide hopper, a manual control ball valve, a dustproof cover, a stainless steel flexible pipe, a rotary universal ball and a solder paste buffer box, the solder paste can be conveniently taken during the welding of a printed circuit board. Therefore, the use convenience is improved. Due to the arrangement of an adjusting sleeve, a magnet block, a wiping sponge pad, an adjusting screw and a welding magnifying lens, the magnifying welding operation is facilitated when small parts are welded on the printed circuitboard. Therefore, the wiping sponge pad can be used for wiping the lens welded with the magnifying lens.