Prepayment gas meter

The utility model discloses a prepayment gas meter, which comprises a gas base meter and a control mainboard, and is characterized in that the gas base meter comprises a shell, a register and a motorvalve; the register and the motor valve are arranged in the shell, and the motor valve is arranged on a gas inlet pipe of the gas meter and used for controlling circulation of gas in the gas meter. The control mainboard is arranged in the shell and comprises a flow collector, a valve controller, an NB-IoT communication device and an NFC communication device. The flow collector is connected with the register and is used for collecting the flow used by the gas meter; the valve controller is connected with the motor valve and used for controlling opening and closing of the motor valve. The NB-IoTcommunication device is used for remote communication of the gas meter; the NFC communication device is used for near field communication of the gas meter. By the adoption of the scheme, a user can use the mobile device to co