The invention discloses an abnormal electricity consumption judging method based on analysis of abnormal electric quantity. The method comprises a fluctuating electric quantity analysis process and a zero electric quantity analysis process; the fluctuating electric quantity analysis process comprises the steps: analyzing and giving a user list with possible abnormal electric quantities; with respect to an user with abnormal electric quantity, appointing the electricity consumption in a certain period and comparing it with the specific historical electricity consumption of the user, calculating a fluctuation proportion and considering the user to be the abnormal electricity consumption user when the fluctuation proportion exceeds the expected fluctuation percentage value. The zero electric quantity analysis process comprises the steps: giving a list of electricity users, the daily electricity consumptions of which are zero and are abnormal electricity consumptions; analyzing and checking the abnormal users by work staff and confirming what users with abnormal electric quantities are true abnormal electricity consumption users. The abnormal electricity consumption judging method based on analysis of abnormal electric quantity has the advantages of immediately knowing power users' electricity consumption information, preventing and monitoring electricity stealing behaviors and improving power supplying reliability and the like.