High precision hard turning CNC lathe, with high rigidity structure and micrometer level positioning accuracy, achieves efficient machining of hardened workpieces by turning instead of grinding. Complete the cutting of outer circles, inner holes, end faces, grooves, and complex contours in one clamping process, greatly reducing clamping errors. The dimensional accuracy and positional accuracy are stable and controllable, and the surface smoothness is close to the grinding effect. Compared with traditional processes, it has higher processing efficiency, shorter procedures, better yield rate, and lower overall cost. It is suitable for mass production of precision hard parts such as bearings, shafts, molds, and hydraulic valve cores, providing stable and reliable precision machining solutions for high-end manufacturing.