The invention discloses a numerical control system remote monitoring and debugging method based on a virtualization technology. The numerical control system remote monitoring and debugging method based on the virtualization technology comprises a virtual upper computer on a remote server, a local lower computer and a remote monitor terminal, wherein a remote monitoring and debugging module, a secure login authentication module and an intelligent diagnosis module are integrated on the virtual upper computer, the secure login authentication module is used in secure login authentication of the virtual upper computer, the remote monitoring and debugging module is used to display status data fed back to the virtual upper computer from the local lower computer through the remote monitor terminal after being verified, and simultaneously inputs the status data to the intelligent diagnosis module so as to perform fault early warning and/or health diagnosis on a machine tool, and a fault early warning or diagnosis result can be displayed on the corresponding monitor terminal. The numerical control system remote monitoring and debugging method based on the virtualization technology achieves remote monitoring and debugging for a numerical control system based on virtualization, improves intelligent level and reliability of numerical control machining, and reduces maintenance cost of a plant.