Processing device for building waterproof prefabricated part

The invention discloses a processing device for building waterproof prefabricated parts, and belongs to the technical field of building part processing devices. The pushing assembly comprises an air cylinder arranged at the top end of the frame, a piston rod at the bottom end of the air cylinder is provided with a positioning installation assembly through a support, and the pushing assembly drives a welding device on the positioning installation assembly to move up and down through the air cylinder; the positioning installation assembly comprises a fastening ring inserted into the support, arc-shaped clamping plates in an annular array are fixedly installed on the inner wall of the fastening ring, step blocks are integrally formed and connected to the extending positions of the outer walls of the arc-shaped clamping plates, and trapezoidal grooves formed in the inner walls of the arc-shaped clamping plates are connected to the other opposite ends of the arc-shaped clamping plates. The technical problems that