NB-IoT gas meter and use method thereof

The invention relates to an NB-IoT gas meter. The NB-IoT gas meter comprises a shell, a cover body, a gas metering device, a gas inlet pipe, a controller and an electric valve. The shell is provided with a cavity and is provided with an upper side wall, a lower side wall, a left side wall, a right side wall and a rear side wall, and the gas metering device is contained in the cavity of the shell. The cavity of the shell is further provided with an anti-disassembly assembly, and the anti-disassembly assembly comprises a pressure sensor and an abutting part. The abutting part can move back and forth relative to the pressure sensor so as to press or get away from the pressure sensor. The cover body is used for closing or opening the opening of the shell. When the cover body seals the opening of the shell, the abutting part is pressed against the pressure sensor. The gas inlet pipe is communicated with the gas inlet end of the gas metering device. The electric valve is arranged on the gas inlet pipe, the pressure