The invention relates to a method for judging reversed polarity of a current metering circuit of three-phase four-wire energy meter users and calculating fixed power. By analyzing the power consumption information that the three-phase four-wire energy meter users store in a power consumption information collection system, the judgment of the reversed polarity of the current metering circuit of thethree-phase four-wire energy meter users is realized. By dividing the three-phase four-wire energy meter users for the reversed polarity of the current metering circuit into two classes of non-distributed photovoltaic three-phase four-wire energy meter users and distributed photovoltaic three-phase four-wire energy meter users, the judgment of the reversed polarity phase of the current metering circuit for the above two classes of users is respectively realized. A method for calculating fixed power of the three-phase four-wire energy meter users of the reversed polarity of the current metering circuit is given. The invention achieves the purposes of improving work efficiency, saving human and material resources and ensuring electricity market operations.