When the work will implement on the need for alignment (bending) of the upper rail. Hook beam aligning equipment central point, with straight beam supporting rod 12 will frame supported, then swinging lever, the plunger pump 1 continuous work (suction, pressure oil), high pressure oil into the working cylinder 2, the piston rod oil cylinder plug 3 out, 8 in left A generated at the rail a driving force of FA, and through the activities of the top 11 in the right end point C generates a constraint force FC, at the same time, the middle hook beam plug 15, on the rail will straightening (bending) site of B points, and generates a constraint force FB (Wan Quli), according to the lever principle (three parallel Li Pingheng) can realize the rail straightening and bending. When the rail deformation extent to meet the requirements, the unloading valve 5 release, the piston is the function of the reset spring 7, back to the original position of the cylinder, straightening (bending) rail work. In order to prevent the oil line failure can not return, causing the machine can't take off, in the cylinder rear installed emergency oil return valve 9, to ensure the safe use of the machine.