The waste plastic recycling device comprises a smashing and melting mechanism, a plastic extruder, a discharging and cooling mechanism and a cutting mechanism. The crushing and melting mechanism, theplastic extruder and the discharging and cooling mechanism are sequentially communicated; the cutting mechanism is arranged at the discharging end of the discharging cooling mechanism so as to cut offthe continuous strip-shaped plastic discharged by the discharging cooling mechanism. According to the utility model, the recycling of the waste plastic is realized, the granular solid plastic can beoutput from the nozzle after the waste plastic is fed from the feeding hopper, and the output granular solid plastic can be directly used as a raw material for industrial production or 3D printing.