Prefabricated laminated slab trepanning device

The utility model discloses a prefabricated laminated slab trepanning device which comprises a machining frame, the machining frame is of a U-shaped design, a containing groove is formed in a machining platform of the machining frame, a lifting groove is formed in the surface of the vertical part of the machining frame, a lifting screw rod is rotationally arranged in the lifting groove through a lifting motor, a lifting plate is arranged in the machining frame, and the lifting screw rod is rotationally arranged in the lifting groove through a lifting motor. The lifting plate is connected with the lifting screw through a connecting mechanism, trepanning equipment and a spray head are arranged on the bottom wall of the lifting plate, a water pump is arranged on the upper end face of the machining frame, a winding roller is rotationally arranged through a supporting plate, and a rack is fixedly arranged on the upper end face of the lifting plate. By arranging the winding roller, the rack and the gear assembly, t