Abstract: The isolated communication of existing mine-used sensor modularization often uses optical coupling to realize communication. In view of the problems that optical coupling isolation has smaller device, close space isolation, vulnerable electromagnetic interference to the front by isolated back-end. The design of isolating circuit based on infrared correlation tube is presented in this paper; the isolating circuit has the advantages of strong anti-interference, isolated back-end and front-end, stable performance. Scheme was introduced in detail including isolated power supply designing, isolating circuit design, circuit parameter analysis. The isolating circuit is a better application and validation in the current sensor, which can satisfy the existing mine isolation requirements such as the number and frequency of the sensor signal.