Abstract: As a key enabling technology to promote the development of intelligent manufacturing, digital twin is drawing great attention on applying in the field of CNC machine tool. However, the lack of general and fundamental standards such as technical terms, reference architecture, key technology leads to problems of application in the field of CNC machine tool. Therefore, digital twin standards of CNC machine tool are urgently required. This study analyses the demand of digital twin standards of CNC machine tool. Based on the above research, combined with five-dimension on digital twin model and research on digital twin technology, this study constructs the framework of digital twin standard system of CNC machine tool, which contains fundamental standards such as general requirements, safety, test methods and key technology standards such as CNC machine tool configuration, data processing, connection and interaction. Discussion is done on the application and function of digital twin standards of CNC machine tool. Hope this work can not only give reference for researchers of digital twin standards and CNC machine tool standards, but also guide for digital twin application in the field of CNC machine tool.