The utility model discloses a prepayment single -phase electric energy meter based on SOC chip, including power supply circuit and with metrological control circuit connection's clock circuit, memorycircuit, display circuit and sampling circuit, the power supply circuit power supply, the clock circuit provides standard clock signal, memory circuit storage working parameter, the display circuit externally shows working parameter, the metrological control circuit is uploaded to the voltage and the current signal of the power supply line that sampling circuit sampling electric energy meter is connected, the measurement of electric energy is accomplished and the control of electric energy meter to metrological control circuit received sample signal. The utility model provides a prepayment single -phase electric energy meter based on SOC chip, through the replacement of the framework of the double chip with present for the mode based on SOC chip framework, the cost is reduced not only, thetechnical scheme of single SOC chip has realized the high accuracy and the high reliability of electric energy measurement in addition.