Supporting device for steel structure building construction

The utility model relates to a supporting device for steel structure building construction, which comprises a mounting seat arranged between two mutually parallel supporting seats, two assembling seats are arranged on the mounting seat in a sliding manner, a positioning disc is fixedly arranged at the upper end of each assembling seat, a supporting rod is rotatably arranged on one side of each positioning disc, and the supporting rods are fixedly arranged on the mounting seats. An adjusting mechanism is arranged on the side, away from the positioning disc, of the supporting rod, a matching hole matched with the adjusting mechanism is formed in the positioning disc in the circumferential direction around the central axis of the positioning disc, and a positioning mechanism located on the side face of the assembling base is arranged on the other side of the positioning disc. A positioning hole matched with the positioning mechanism is formed in the upper end face of the mounting base, and a supporting beam is a