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Aiming at the characteristics of long-distance transmission and anti-interference ability of LoRa communication technology but only supporting half-duplex communication, a TDMA-based communication networking method is proposed. The method can accommodate multiple communication devices under the same channel by dividing channels and time slots, and can fully utilize the channel when channel resources are limited. The LoRa-based UE equipment accesses the LoRa-based central base station in a star-shaped networking manner, and the central base station can control the accessed equipment and the channel time slot management, and the appropriate gateway can also access the Internet. In order to improve the utilization of channel time slots and the range of activities of the handheld UE personnel, a method of randomly accessing the central base station is adopted. According to the characteristics of the communication networking mode, the corresponding uplink and downlink communication protocol is designed and a unique label is added to the UE, which satisfactorily solves the contention conflict in the process of accessing the base station. Experimental tests show that the TDMA-based LoRa network can randomly access the central base station to expand the range of activities of the users and improve channel utilization.