Steel structure welding device

The utility model relates to the technical field of steel structure welding, in particular to a steel structure welding device. According to the technical scheme, the welding machine comprises a first hydraulic rod, a workbench, threaded sliding sleeves, a motor, a mounting plate and a welding machine body, a mounting groove is formed in the upper end of the workbench, the motor is arranged on one side in the mounting groove, a threaded rod is arranged at one end of the motor, and the outer wall of the threaded rod is rotationally sleeved with the threaded sliding sleeves; first hydraulic rods are arranged above the threaded sliding sleeves correspondingly, clamping plates are arranged at one ends of the first hydraulic rods correspondingly, supporting legs are arranged on the lower surface of the workbench, a mounting plate is arranged between the supporting legs, a supporting plate is arranged below the mounting plate, and second hydraulic rods are arranged in the four corners of the mounting plate. Accordi