Positioning structure for steel structure welding

The utility model relates to the technical field of positioning structures, in particular to a steel structure welding positioning structure which comprises a working plate, a sliding groove is formed in the position, close to the rear end, of the top face of the working plate, a plurality of supporting legs arranged in a matrix mode are fixed to the bottom end of the working plate, and a U-shaped positioning cover is fixed to the top face of the working plate. The positioning device is arranged on the top surface of the working plate close to the front end and is used for positioning a steel structure to be welded; the auxiliary mechanisms are arranged on the inner walls of the left side and the right side of the positioning cover; a steel structure needing to be welded can be positioned before welding through the positioning mechanism, the auxiliary mechanisms and the baffle, and after welding is completed, two electromagnets in the positioning mechanism can be closed and pull rods in the auxiliary mechanis