The utility model discloses a high-tension overhead power transmission line airborne three-dimensional laser radar detecting system, which comprises an airborne craft and a laser radar system arrangedon the airborne craft, wherein the laser radar system comprises a GPS locating system, a laser scanning distance-measuring system, an inertia navigation system and a data processing system, the laserscanning distance-measuring system comprises a laser transmitter and a receiver, the GPS locating system, the laser transmitter, and the receiver and the inertia navigation system are respectively connected with a data processing system. The system can obtain the line corridor high precision landform and high definition image data, can rapidly and highly-effectively discover major natural disasters of mountains, such as collapses, moving and landslides and the like, realizes visual management of the line corridors, and has the characteristics of high efficiency, safety and accuracy compared with a traditional means. After the system is adopted, the detection precision is high, the field operation period is greatly reduced, the data achievement also can be used for later period line corridor three-dimensional visual management application, and the economic and the social effects are obvious.