Steel structure welding device

The utility model discloses a steel structure welding device. Outer frame, supporting columns are fixedly connected to the four corners of the bottom of the outer frame. Supporting rods are fixedly connected to the four corners of the top of the outer frame. Limiting frames are fixedly connected to the top ends of the supporting rods. Sliding rails are arranged on the two sides of the top of the outer frame. A sliding rod is arranged between the sliding rails; a welding assembly is arranged in the middle of the sliding rod, an inner frame is arranged in an inner cavity of the outer frame, pressing rods are slidably connected to the middles of the two sides of the outer frame and the inner frame in a penetrating mode through formed round holes, round pressing plates are fixedly connected toone ends of the pressing rods, pressing rod heads are fixedly connected to the other ends of the pressing rods, and gaskets movably sleeve the outer walls of the pressing rods and located between theinner frame. The movable