Abstract: In order to measure the distance of cageway spacing in real-time and solve the problem of complicated operation and low precision of coal mine cageway measurement, a low power consumption fixed cageway spacing measuring instrument based on LoRa communication method was developed. The instrument, using low-power, remote narrowband communication mode LoRa, can not only upload the cageway spacing data in real time, but also set up other terminals of the network through the way of self-organizing network; combined with low-power chip STM32L476, it achieves the real-time communication requirement for complex scenes in mining area with small data volume.