A system and method for monitoring production of CNC machines is provided. The system comprises a monitoring host and a displaying device. The monitoring host comprises an NC interpreter, a production analysis module, and a user interface module. The NC interpreter interprets first format data received from CNC machines into second format data saved within a temporary file. The production analysis module analyzes control codes and parameters of control codes contained in the temporary file to obtain current operation states and information of CNC machines connected to the monitoring host. The user interface module transforms the collected current operation states and information of CNC machines into a user-friendly interface that is displayed on the displaying device, such as a monitor.