Abstract: Aiming at the difficulty and high cost of implementing digital twin modeling technology in the engineering practice of CNC machine tools, a multi-dimensional and multi-level digital twin modeling method for CNC machine tools is proposed, and a digital twin system is developed to achieve visualization of the operation process of CNC machine tools. Firstly, construct a digital twin model for CNC machine tools from four dimensions of physical entities, digital twin models, information physical fusion of data and services, as well as four levels of geometry, physics, behavior, and data. Secondly, based on this method, a digital twin system for CNC machine tools is designed and developed to achieve the software based modeling technology of digital twins. Finally, taking a certain type of CNC machine tool as an application case, using NC code to control the movement of machine tool entities, utilizing the connection relationship between digital twin models and machine tool entities, driving the machine tool model for motion simulation, and visualizing the model's operating status and various data. The results indicate that all functions of the system are operating normally, and the proposed method is feasible, providing reference for the engineering application of digital twin modeling technology in the field of CNC machine tools.