Skylight part welding tool

The skylight part welding tool comprises a bottom plate, supporting plates are welded to the positions, close to the four corners, of the outer wall of the top of the bottom plate, a limiting mechanism is arranged on the outer wall of the top of the bottom plate, L-shaped plates are welded to the two side walls of the bottom plate, an auxiliary mechanism is arranged between the two L-shaped plates, and the limiting mechanism comprises a lead screw and a transverse groove; one ends of the lead screws are rotationally connected to the outer side walls of the supporting plates, the transverse grooves are formed in the outer wall of the top of the bottom plate, two vertical plates are welded to the positions, between the two supporting plates, of the outer wall of the top of the bottom plate, and the ends, away from the supporting plates, of the lead screws are rotationally connected into the vertical plates. By means of the device, the parts to be machined can be well fixed and limited on the bottom plate, the s