The invention discloses an LoRa self-networking communication system for intelligent ring main units. The system comprises N detection modules, N LoRa units, LoRa network cards and a communication terminal, wherein the N detection modules and the N LoRa units are arranged in N ring main units respectively. According to the system, temperature, humidity, air pressure and other data in the ring mainunits are collected through the detection modules arranged in all the ring main units, the corresponding LoRa units receive the data acquired by all the detection modules respectively, an LoRa wireless sensing network composed of the LoRa network cards establishes connection with the communication terminal, an instruction can be issued, and the ring main unit data can be viewed. Since LoRa self-networking wireless transmission has efficient receiving sensitivity, the system is strong in penetrating ability and long in communication distance and meanwhile has stronger anti-interference performance, therefore, the data in the ring main units in all states can be precisely transmitted, and the stability of wireless transmission among all the ring main units is guaranteed.