In order to avoid the problems of cutting tool inaccurate installation, difficult operation and so on for fourposition cutting tool holder, a new four position precision CNC lathe cutting tool holder was designed. The cutting tool holder consists an active part and a fixed part.It can not affected by the type and thickness of the cutting tool,It can be used to achieve an accurate cutting tool installation, and it has a simple operation and good rigidity.The cutting tool holder can ensure the machining precision of the workpiece.