Abstract: In light of the weakness of direct connection between CNC equipment and enterprise information system, many types of CNC systems are not compatible with each other, and there is a lack of remote early warning fault diagnosis. The main communication interface of the CNC system was analyzed in this paper. The networking solution of CNC machine tools based on intelligent manufacturing has solved the interconnection between equipment level, workshop level and enterprise level. A low cost CNC gateway is designed to provide a hardware platform for remote DNC processing and early warning fault diagnosis. The technology scheme is suitable for FANUC, MITSUBISHI and SIEMENS serialization numerical control systems. It is a low cost networking plan for intelligent manufacturing.