Special device for welding sheet metal rack

The utility model relates to the technical field of machine frame welding, in particular to a special device for welding a sheet metal machine frame, which comprises a rotating shaft, electric push rods are respectively and rotatably connected to two sides of the rotating shaft, an adsorption plate is fixedly connected to the outer sides of the electric push rods, and two circular grooves and a vacuum chuck are arranged on the outer side of the adsorption plate. The device has the advantages that the two electric push rods are rotationally connected through the rotating shaft, so that the two adsorption plates can rotate relatively, the angle between the two adsorption plates can be adjusted according to needs, and when the two adsorption plates adsorb two metal plates, the angle can be fixed by adjusting the angle of the adsorption plates and fastening the rotary knob; two metal plates are fixed at a required included angle to be welded, so that the device can realize fixed welding of the metal plates at mul