The invention relates o a square wave influence test method for a smart electric energy meter. According to the method, the relative error of the electric energy meter under different test conditionsis obtained through using a standard meter method; the simulated test conditions are more in line with the working condition of the smart electric energy meter during field operation, and the accuratemetering of a standard meter under square wave influence can be ensured; and the square wave influence test method can be used for assessing the metering performance of the smart electric energy meter under the simultaneous influence of voltage change, frequency change and square waves and is beneficial to the improvement of the quality of the smart electric energy meter.