Correcting device for bar

A bar correcting device comprises a base, the base is composed of a rectangular upper frame, a rectangular middle frame and a plurality of stand columns, a plurality of longitudinal supporting beams are fixed to the upper frame, a vertical supporting column is fixed to the rear side of the base, and a horizontal longitudinal supporting arm is fixed to the upper end face, extending out of the base, of the upper end of the supporting column. The front end of the supporting arm is located over the base and is fixedly connected with a vertical positioning thread sleeve in an inserted mode, a vertical lead screw is connected into the positioning thread sleeve in a threaded mode, a connecting column is formed at the upper end of the lead screw, and a hand wheel is fixedly welded to the connecting column; cushion blocks are fixed to the portions, on the two sides of the lead screw, of the supporting beam, transverse V-shaped notches are formed in the cushion blocks, transverse guide shafts are connected to the porti