Fuente: Wipo "IOT" The invention provides an NB-IoT network system based on a local area wireless ad hoc network and a networking method. The networking method comprises the following steps: forming a local area ad hoc network among a plurality of NB-IoT devices to realize communication between any two NB-IoT devices; calculating the comprehensive weighted value of each NB-IoT device by taking the NB-IoT device with the highest comprehensive weighted value in the local ad hoc network as the NB-IoT device node of the communication, wherein the comprehensive weighted value comprises the comprehensive weighted value of the signal strength weighted value and the battery electric quantity weighted value of the NB-IoT device; and connecting and communicating the NB-IoT device needing communication in the local area ad hoc network with the external NB-IoT base station through the NB-IoT device node. According to the invention, the problems that the NB-IoT equipment cannot receive the NB-IoT network signal and the NB-IoT network signal cannot be transmitted at high power due to insufficient battery can be effectively solved.