The invention relates to an audio/ video monitoring system for preventing electricity sealing of an electric energy meter. The system comprises an audio/ video monitoring device, wherein the audio/ video monitoring device comprises an audio sensitive monitoring probe, a CPU and an audio/ video acquiring device; the audio/ video monitoring device is connected with a user phone and a user computer. The system works by the method comprising the steps of setting the audio spectrum range and audio threshold in the CPU; starting the audio sensitive monitoring probe; uploading data; comparing and determining the data by the CPU and generating a triggering signal; starting the audio/ video acquiring device to work and uploading a signal to the CPU; storing the data through the CPU and synchronously uploading to the user phone or a user terminal; determining the electricity stealing behavior through the user phone or the user terminal and performing measures. The system is reasonable in structure, reliable to transmit data, able to comprehensively monitor the electricity stealing behavior so as to provide strong evidence for attacking the electricity stealing behavior.