The invention discloses a positioning method and system for a power patrol scenario, and the solution comprises the following steps of obtaining positioning point cloud of the inspector based on a binocular camera, and performing closed loop screening on the positioning point cloud and the scenario point cloud in a pre-constructed patrol scene; if the scenario point cloud is obtained by the closedloop screening, performing pose compensation on the current positioning point cloud based on the screened scenario point cloud to determine the position of the inspector; and otherwise, determining that the current position of the inspector is not within the scope of the patrol scenario. The invention carries out closed-loop screening between the positioning point cloud and the scenario point cloud of the inspector and accurately finds the scenario point cloud with the highest matching degree with the positioning point cloud to improve the matching accuracy between the positioning point cloudand the scenario point cloud. In addition, by pose-compensating the positioning point cloud, the initial pose error of the inspector can be reduced and the positioning accuracy of the inspector can be improved.