Welding device for steel structure building construction and using method thereof

The invention discloses a welding device for steel structure building construction and a using method thereof, and relates to the technical field of steel structure welding, the welding device for steel structure building construction comprises a machining platform and supporting feet, a top beam is fixedly connected to the rear portion of the upper end of the machining platform, and fourth sliding rods are fixedly connected to the two sides of the rear portion of the inner wall of the upper portion of the top beam; an adjusting assembly is installed on the front side of the inner wall of the upper portion of the top beam. Through cooperation of the frame, the laser baffle, the tooth roller, the gear, the driving motor and the laser welding head, in the moving process of the frame, the shielding part and the through hole part of the laser baffle intermittently appear below the laser welding head, equidistant shielding of a laser beam is achieved, and then equidistant spot welding of a pipe fitting can be achi