The invention discloses an electric meter main board with a metering circuit. The electric meter main board with the metering circuit is characterized by comprising a microprocessor, a metering circuit, a communication module, a display module, an expense control module, a clock module, a multifunctional output module and a power supply module, wherein the metering module, the communication module, the display module, the expense control module, the clock module and the multifunctional output module are connected with the microprocessor and the power supply module; the metering circuit comprises a metering module connected with a power frequency power supply; the metering module comprises a metering chip, a current sampling loop, a voltage sampling loop and a pulse generating loop; the current sampling circuit and the voltage sampling circuit are connected with the power frequency power supply and the metering chip. The current signal and the voltage signal of the power frequency power supply are monitored and are directly converted into pulse to be outwards sent to the microcontroller through the metering module; the subsequent metering work is completed through the microcontroller, so that the structure of the circuit is simple; the functions are complete.