Along with the improvement of the machining accuracy and efficiency of parts, the realtime status information of machine tools plays an important role in the dynamic adjustment of machining parameters. A multi machine tool status information monitoring system is researched based on several HuaZhong Computer Numerical Control(CNC) HNC8 machine tools. The STMicroelectronics Microcontroller STM32 system was used as the intelligent terminal and the Transmission Control Protocol/Internet Protocol(TCP/IP) was transplanted. The information collection of the key points temperature, motion position, spindle speed and feed speed were realized, and the information transmission network of multi intelligence terminal was built on the basis of Controller Area Network (CAN) bus, and the upper computer monitoring system was developed based on C# language. The experimental results show that the system has stable work, good reliability and good expansibility, which can effectively improve the efficiency of machine tool monitoring and reduce the cost of operation.