Fecha de publicación: 27/07/2021 Fuente: Wipo "IOT" The utility model provides a radio frequency anti-interference circuit of an NB-IoT (Narrow Band Internet of Things) water meter and the NB-IoT water meter. The radio frequency anti-interference circuit is characterized in that a battery is respectively connected with a first magnetic bead, a second magnetic bead and a first filter circuit; the second magnetic bead, the MOS tube and the NB-IoT module are connected in sequence; the first magnetic bead, the linear voltage stabilizing chip and the MCU are connected in sequence; the first filter circuit, the isolating circuit, the non-magnetic metering interface, the second filter circuit and the non-magnetic metering module are connected in sequence; the non-magnetic metering module collects a flow signal of the NB-IoT water meter; the MCU sends the processed flow signal to the NB-IoT module; the NB-IoT module sends the processed flow signal to a remote system through a transmitting signal; the conducted interference of the NB-IoT module is effectively isolated through the first filter circuit, and the isolation circuit prevents the power jitter caused by the voltage drop of the battery when the NB-IoT module communicates. The second filter circuit filters radiation interference, and the accuracy of the non-magnetic metering module is improved.