According to the high-frequency data of residential electricity meter collected based on the HPLC (broadband carrier waves) platform and the phase recognition results, this paper selects the minimum current value from the 24 points current data of the total table for each phase, takes the average voltage data of the same-phase residential electricity meter as the reference voltage, determines the line impedance by the line properties matching the platform transformer capacity, calculates the upper and lower limits of each phase voltage of the whole platform area, determines the range of input-voltage of each household meter, and compares it with the voltage value collected by the collection system to realize the automatic monitoring of voltage misalignment for the residential electricity meter, so as to timely detect measurement fault, platform area belonging error, burning table hidden danger, etc. This method is developed in the electricity marketing analysis platform, and the monitoring accuracy rate reached 68% after the field verification, it can improve the efficiency of voltage misalignment judgment and provide technical support for the fine management of electricity marketing.