Fecha de publicación: 14/12/2021 Fuente: Wipo "IOT" The utility model belongs to the technical field of communication, and particularly relates to an NB-IOT communication module comprising a machine box, the upper end of the machine box is provided with a top cover, the machine box is internally provided with an NB-IoT communication module, the surface of the lower end of the NB-IoT communication module is provided with heat dissipation fins, the machine box is internally provided with a connection fixing device, and the connection fixing device is provided with a heat dissipation device. According to the NB-IoT communication module, heat dissipation fins are arranged at the bottom of the NB-IoT communication module, heat dissipation of the interior of the NB-IoT communication module can be accelerated through the heat dissipation fins, the long-time use effect of the machine box is improved, and the NB-IoT communication module is convenient to use. The NB-IoT communication module and the heat dissipation fin are provided with the limiting grooves in the surface of one end, so that the NB-IoT communication module, the heat dissipation fin, the connecting and fixing device and the upper clamping block can be conveniently positioned during clamping, the fixing effect is improved, the sliding track of the upper clamping block can be positioned by arranging the sliding block and the sliding groove, and the stability during sliding and fixing is enhanced.