Fecha de publicación: 31/08/2021 Fuente: Wipo "IOT" The utility model relates to an NB-IoT (Narrow Band Internet of Things)-based gateway device and a meter reading system, a processor, an NB-IoT module and an RF (Radio Frequency) module are arranged in the gateway device, the NB-IoT module and the RF module are respectively connected with the processor, and the gateway device is positioned in an area covered by an NB-IoT communication network; the NB-IoT module of the gateway device is in NB-IoT communication connection with the master station, and the RF module of the gateway device is in RF communication connection with the at least one sub-ammeter which is not covered by the NB-IoT communication network, so that the NB-IoT communication connection between the gateway device and the master station and the RF communication connection between the gateway device and the sub-ammeter are realized; the interaction data of the master station and the sub-ammeters are transmitted in an intermediary manner through the gateway device, so that the data reading operation of the master station on the sub-ammeters which are not covered by the NB-IoT communication network is met, the engineering wiring complexity is reduced, and the transmission stability of the data of the ammeters is ensured.