Automatic welding device for scaffold steel structure

The utility model provides an automatic welding device for a scaffold steel structure, which comprises a base, an automatic welding device and a welding device. The two box bodies are assembled at the two ends of the base in a sliding manner and are symmetrically distributed relative to the placement seat; the sliding seat is assembled in the box body in a sliding manner along the length direction of the base; the rotary assembly is fixed on the sliding seat; the clamping piece is correspondingly connected to the rotary assembly and extends out of the box body in the length direction of the base; and the driving assembly drives the two box bodies to do relative motion in the length direction of the base, so that the to-be-welded workpiece is released or clamped through the clamping piece. The two box bodies do relative motion relative to the clamping piece, so that the to-be-welded workpiece is clamped, the to-be-welded workpiece is driven to rotate through the rotary assembly, and the requirement for circumf