Steel box girder welding support frame

The utility model discloses a steel box girder welding supporting frame which comprises a supporting column, a reinforcing block is fixed on the inner side wall of the supporting column, a reinforcing structure comprises a mounting plate, the mounting plate is fixed at the top end of the other side of the supporting column, a threaded groove is formed in the mounting plate, a threaded rod is arranged in the threaded groove, and the threaded rod is fixed on the top end of the other side of the supporting column. A rotating disc is fixed to the bottom end of the threaded rod, and a fixing block is movably connected to the top end of the threaded rod. By arranging the reinforcing structures, the mounting plates are connected and fixed to the two sides of the supporting column, the threaded grooves are symmetrically distributed in the mounting plates, and through the threaded structures of the threaded grooves and the threaded rods, the threaded rods can rotate in the threaded grooves and grasp the rotating discs