Joint welding device for reinforcing steel structure factory building

The utility model discloses a seam welding device for reinforcing a steel structure factory building, which relates to the technical field of welding devices and comprises a lifting base, a guide rail component arranged on the lifting base, a welding device arranged on the lifting base and a workpiece rotating and clamping mechanism which is arranged on the guide rail component in a sliding manner and has an adjustable clamping distance, the welding device is matched with the workpiece rotating and clamping mechanism, and the positioning assembly is used for positioning the position of the workpiece rotating and clamping mechanism. The welding device is reasonable in design, the guide rail assembly comprises a plurality of guide rails which are parallel to one another, the number of the guide rail assembly is preferably two, the positioning assembly is locked and locked on the lifting base after the position of the workpiece rotating and clamping mechanism is adjusted, comprehensive welding can be convenientl