Abstract: This paper focuses on the design of CAN communication technology in the coal mine monitoring system. Through the comparison of the existing system communication modes and the existing problems, the paper analyzes the digital design of the new CAN communication. The new CAN communication adopts the “multi-master” data competitive interactive mode with shorter inspection cycle; the circuit EMC design adopts isolated power module combined with the transient suppression diode, sub-sensitive resistor and gas discharge tube, and the effect is good.