Prefabricated part forming device convenient to demould

The prefabricated part forming device comprises a base, a mold frame, a cover plate, a lifting plate, a fixing plate, a demolding plate and a pull rod, the mold frame is arranged on the base in a lifting mode, stand columns located on the two sides of the mold frame are arranged on the base, the fixing plate is arranged at the tops of the stand columns, and the demolding plate is arranged on the cover plate. The cover plate is arranged above the mold frame in a liftable mode, the lifting plate is arranged at the bottom of the first lifting driving device, a connecting block is arranged between the lifting plate and the cover plate, wing plates are arranged on the two side faces of the mold frame respectively, and the pull rods are symmetrically arranged at the bottom of the lifting plate and penetrate through the corresponding wing plates downwards. A limiting block is arranged at the bottom of the pull rod, a stepped hole extending to the top face is formed in the bottom face of the cover plate in an inwards