Abstract: With the deepening of the integration of information technology and industrialization, industrial control systems of computerized numerical control (CNC) machines is gradually changed from the original isolated closed mode into the Internet model. It is not only facing the internal threat, but also facing the threat from the Internet. The existing industrial control system of CNC machine is due to long-term in a closed environment. The system cannot be updated in time; it is difficult to defend against the threat of industrial networks from the Internet. In view of the above problems, this paper firstly puts forward the security and trusted framework for CNC machine control system based on trusted computing technology, and elaborates the frame composition and function principle in detail. Then, the module of the trusted communication monitoring and control for the control system of CNC machine is presented; it can realize the scalability of the CNC machine system and the correlation of the equipment, while satisfying the trusted measurement function. Finally, this paper analyzes the reliability of the traditional CNC machines by means of experimental simulation. The performance shows that in the controllable range, the proposed framework can effectively enhance the CNC machine computing environment security.