Steel structure welding tool

The utility model discloses a steel structure welding tool. Including a support base, supporting cushion blocks are fixedly mounted at the four corners of the bottom of the supporting base correspondingly. Wherein four supporting columns which are symmetrically distributed are welded at the top of the supporting base; l-shaped side plates are welded to the four supporting columns, a hydraulic cylinder is fixedly installed in the middle of the top of the supporting base, the output end of the hydraulic cylinder is fixedly connected with one end of a hydraulic rod, the other end of the hydraulicrod is fixedly connected with the bottom of a welding work plate, and T-shaped positioning blocks are welded to the two ends of the welding work plate. The L-shaped side plate is welded to the supporting column, the second T-shaped groove is formed in the inner side of the L-shaped side plate, the second T-shaped groove and the T-shaped positioning block on the welding work plate are installed ina matched mode, and the T