Straightening machine for manufacturing air-tight door

The invention relates to the field of workpiece straightening, in particular to a straightening machine for manufacturing an air-tight door, the straightening machine comprises a conveying mechanism and a workbench which are arranged in sequence, wherein a jacking plate hole is formed in the workbench, and the conveying mechanism is used for conveying I-shaped steel machined by the straightening machine to the position above the jacking plate hole in the workbench; a jacking assembly capable of penetrating through the jacking plate hole to jack up the I-shaped steel is arranged below the jacking plate hole, and extrusion assemblies used for applying extrusion force to the I-shaped steel jacked up by the jacking assembly are arranged on the two sides of the upper portion of the jacking plate hole; a pressure drop assembly is arranged above the jacking plate hole and used for applying downward extrusion force to the I-shaped steel jacked up by the jacking assembly. The simple tractable vehicle axle lifting devi