1. The precision straightener can be universal to the stepped workpiece or the long bar. The two spindle rollers can move around the workpiece extrusion and straightening at the same time through the hydraulic principle. 2, especially for hard work straightening effect is better, such as auto parts rod, half shaft and petroleum machinery rod and standard parts, etc. 3, according to the requirements of the workpiece with automatic loading and unloading structure and long bar material automatic feeding and receiving machine.