Steel structure flattening and correcting device

The utility model relates to a steel structure flattening and correcting device, which belongs to the field of steel plate processing equipment and comprises a workbench, a connecting seat parallel to the workbench is arranged above the workbench, a plurality of supporting rods are fixedly connected between the workbench and the connecting seat, and the supporting rods are close to the edge of the workbench. The side, close to the workbench, of the connecting base is horizontally and slidably connected with a sliding table parallel to the connecting base, the side, close to the workbench, of the sliding table is horizontally and slidably connected with a sliding table parallel to the sliding table, the sliding table is perpendicular to the sliding direction of the sliding table, and the side, close to the workbench, of the sliding table is fixedly connected with a hydraulic cylinder. A piston rod of the hydraulic cylinder is arranged on the upper surface of the workbench and fixedly connected with a correctin