The invention relates to an automatic compensation method for voltage change of an electric energy meter. Power-on initialization is performed to obtain an initialized power error calibration gain value and an initialized power offset calibration gain value; a rated voltage Un, the current lambdaIb and a power factor 1.0 are outputted by a programmable power source to a calibrated meter; the apparent power is automatically calculated by an MCU of the calibrated meter through obtaining the active power and the reactive power of the calibrated meter; a power error of the calibrated meter and a power error calibration gain value are calculated; a power offset calibration gain value is calculated; when errors between the active power and the standard active power and the reactive power and thestandard reactive power after calibration are within the permissible range, current and power factors are kept unchanged, output voltages of a programmed power source for the calibrated meter are sequentially changed, and different output voltages are utilized for meter calibration. The method is advantaged in that only the power error is calibrated, the method is suitable for metering small currents of the electric energy meter, metering accuracy of the electric energy meter is high, and meter calibration efficiency is improved.