The invention provides a wireless sensor network MAC (Medium Access Control) protocol realization method based on LoRa (Long Range), so as to solve the technical problems of small network capacity, large power consumption and not strong scalability existing in the wireless sensor network MAC protocol in the prior art. The realization method comprises steps: a LoRa star-type wireless sensor network is firstly built; then, a gateway node divides all terminal nodes into multiple groups according to distances between the gateway node and different terminal nodes in the network, and according to a working sequence, each divided group is sequentially divided into a broadcasting time period, a synchronization time period, a data interaction time period and a reserved time period; and finally, the gateway node transmits broadcasting signals in the broadcasting time period to detect whether to-be-added terminal nodes exist, transmits a beacon frame comprising a synchronization time and slot allocation scheme in the synchronization time period, and communicates with awakened terminal nodes in the data interaction time period. The method of the invention can be used for long-range communication between multiple terminal nodes and the gateway nodes in the LoRa star-type wireless sensor network.