Abstract: The measurement of electric energy meters is affected by different dynamic load conditions, resulting in distortion of current and voltage waveforms and measurement errors. When using a single method to calculate errors, there is a problem of inconsistency between the calculated results and the actual values. Therefore, a calculation method based on segmented Romberg numerical integration is proposed. Using a dynamic error testing device for electric energy meters, analyze the impact of different dynamic load conditions on the measurement performance of electric energy meters, and calculate the measurement result deviation under dynamic load changes. Using the segmented Romberg numerical integration method, by dynamically dividing the integration interval and iteratively optimizing, non steady state signals with wide amplitude fluctuations and high-frequency harmonic interference are processed to obtain the dynamic error calculation results of the electric energy meter. According to the experimental results, it can be seen that under different temperature and humidity environments, the error calculation results using this method only have a maximum deviation of 0.05 and 0.02 from the actual results, indicating that the calculation results using this method are accurate.