The invention discloses a method and system for electric power tunnel safety monitoring, and the method comprises the steps of arranging a plurality of image sensors in an electric power tunnel, and enabling the collection range of the image sensors to completely cover the whole electric electric power tunnel; acquiring a plurality of continuous images in a target area in the electric power tunnelby using the image sensors; randomly extracting a plurality of frames from the plurality of continuous images obtained by each image sensor according to a sequence; preprocessing the plurality of frames extracted by each image sensor to obtain the pixels corresponding to each frame; using a machine learning model to analyze and process the pixels to obtain a target object contained in the image and the type of the target object; and obtaining a safety monitoring result in the target area according to the identified target object and the type and a judgment rule of the target object. Accordingto the invention, the illegal invasion of personnel, the personnel safety helmet wearing and the personnel work clothes wearing in the electric electric power tunnel can be identified, and the methodand the system are suitable for the safety monitoring of the electric electric power tunnel.