Fuente: Wipo "IOT" The invention discloses an NB-IoT device communication system and method. The system comprises a plurality of NB-IoT devices and at least one group of base stations; wherein the NB-IoT equipment which cannot establish connection with the base station in all the NB-IoT equipment establishes connection with the adjacent NB-IoT equipment in sequence and transmits data to the adjacent NB-IoT equipment until the data of all the NB-IoT equipment is transmitted to the base station through the NB-IoT equipment which can establish connection with the base station. The method provided by the invention comprises the following steps: after all NB-IoT equipment is awakened, preferentially trying to establish connection with a base station; when a connection is established with the base station, the received data and own data are transmitted to the base station; when the connection with the base station is not established within the set time, sending a connection request to the NB-IoT equipment of the upper level according to a set sequence, and sending the received data and the own data to the NB-IoT equipment of the previous level. According to the invention, the arrangement and coverage of the NB-IoT device in the signal blind area are realized.