Rotary lifting device of U-shaped steel forming machine

The utility model discloses a U-shaped steel forming machine rotary lifting device which comprises a frame, a connecting plate is fixed in the frame, a pressing rod is arranged at the bottom of the connecting plate, a rotary lifting device body is arranged between the connecting plate and the pressing rod, and a side roller is arranged on the side, away from the connecting plate, of the pressing rod. After steel is placed above a pressing wheel, a motor starts to work and drives a transmission shaft to rotate, the transmission shaft drives a driving gear to rotate, the driving gear drives a driven gear to rotate through a meshing structure formed by the driving gear and the driven gear, a lead screw is driven to rotate through the driven gear, and lines of external threads of the lead screw are oppositely arranged; the lead screw drives the first sliding block to move, the first sliding block drives the rotating rod to rotate, the pressing rod is driven by the rotating rod to ascend and descend, steel is pres