The invention relates to the technical field of recycling devices, and particularly discloses a plastic recycling device comprising a workbench. A rotating cylinder is rotatably connected on the workbench. The center of the bottom part of the rotating cylinder is provided with an opening for penetration of a cable. The rotating cylinder is internally provided with baffle plates. The center of eachbaffle plate is provided with a through hole for penetration of the cable. Two slide blocks which are symmetrically arranged along the central axis of the baffle plates are slidably connected on thebaffle plates. Each slide block is provided with a blade. Each slide block is connected with a wedge block. A spring is connected between each wedge block and the internal wall of the rotating cylinder. Two friction wheels which are symmetrically arranged along the central axis of the baffle plates are arranged below the workbench. The position of the cutting tool can be automatically adjusted according to the diameter of the cable so that different diameter of cables can be cut and the equipment cost can be saved for the enterprise.