Bending device for steel structure machining

The utility model relates to the technical field of steel structure machining, in particular to a steel structure machining and bending device which comprises a base, a plurality of lifting plates and two adjusting plates are arranged on the base, motors and two fixing plates are connected to the lifting plates respectively, rotating rods and studs are connected to the motors and the fixing plates respectively, and the rotating rods and the studs are arranged on the base. A connecting rod is connected between every two adjacent studs, the two adjacent studs are provided with opposite threads respectively, the rotating rod and the connecting rods are sleeved with a main gear and a driven wheel respectively, the multiple studs are connected with positioning rods, the positioning rods are in sliding connection with the lifting plate, and a positioning roller is connected between every two adjacent positioning rods; a connecting plate is rotationally connected to one of the two adjusting plates, a connecting cyli