Welding device for welding robot

The utility model belongs to the field of welding equipment, and discloses a welding device for a welding robot, which comprises a fixed seat, a positioning mechanism, a welding gun, a welding wire wheel and a positioning mechanism, the bottom of the fixed seat is provided with the welding gun and the welding wire wheel, and the welding wire wheel is positioned on one side of the welding gun and positioned above a welding seam. The positioning mechanism comprises an L-shaped positioning plate, a straight plate, a locking assembly and rolling assemblies, the straight plate is connected with the L-shaped positioning plate through the locking assembly, an n-shaped structure or an h-shaped structure is defined by the L-shaped positioning plate, the locking assembly and the straight plate, and the opposite sides of the L-shaped positioning plate and the straight plate are rotationally connected with the rolling assemblies; the two rolling assemblies are in rolling connection with the side walls, away from each oth