Straightening device for slender shaft workpieces

The utility model discloses a straightening device for slender shaft workpieces, which comprises a mounting plate and a workbench fixed at the upper end of the mounting plate through a support rod, an air cylinder is mounted at the bottom of the workbench, and a power rod is mounted on the air cylinder; the workbench is provided with a movable opening, the sliding block is provided with a transmission rod, the air cylinder is provided with a fixing rod, the sliding block is provided with a fixing disc, the fixing disc is provided with a fixing groove and a fixing screw hole, a fixing bolt is arranged in the fixing screw hole, and the fixing bolt is provided with a fixing head. A shaft can be fixed in the fixing groove through the fixing disc, the fixing screw hole and the fixing head, the shaft can be pulled through the air cylinder, so that the bent part of the shaft is corrected by the straightening groove of the rotating column, and the bent part of the shaft is straightened by the straightening groove of