The embodiment of the invention proposes a power-off and power-on active judgment method, and belongs to the field of power equipment. The method comprises a power-off judgment method and a power-on judgment method, and specifically comprises the steps: obtaining a power-off record set from a database, and extracting power-off time in the power-off record; obtaining the difference between the power-off time and the system time, determining whether there is a need to detect a power-off event of an electric energy meter or not according to the difference, and carrying out the subsequent processing according to the detection result; obtaining the accurate power-off and power-on information through combining the record stored in the database with multiple presetting conditions, thereby solving problems of power-off and power-on alarm leakage and wrong alarm of a conventional terminal. A terminal equipment maintainer carries out the maintenance and change of a terminal with a fault timely according to the information, thereby guaranteeing the normal operation of power equipment, reducing the normal operation of the power equipment, reducing the probability of a power fault, and improving the user experience.