Abstract:The safety detection and analysis of transmission lines is an indispensable part of the intelligent and digital construction of power system. At present, the trend of ultra-high voltage and large capacity building of transmission line increases the difficulty of transmission line detection and maintenance. So to improve the efficiency of artificial inspection, break through the limitations of complex terrain to patrol, space positioning accuracy, we design a based on laser point cloud data analysis system for transmission line safety testing. Automatic classification system function mainly includes the power point cloud corridor extraction, analysis of safety inspection, to be able to power, data transmission equipment such as tower, and building, river and other corridors automatic classification feature data are extracted; By detecting the distance between the power line and other corridor objects, the danger point type is identified and the safety analysis report is generated. For validity verification system, the system analysis and artificial field measurement data, this paper compares and analyzes the results show that the system can accurately distinguish transmission lines dangerous points, has higher application value.