The invention provides a method for designing a power line patrol route of a fixed-wing unmanned aerial vehicle-mounted laser radar. The method comprises the following steps: calculating a turning angle formed by every three adjacent waypoints by starting from a first waypoint of a measuring area; setting a comparison value of the turning angle; if the turning angle is greater than the comparisonvalue, setting normal turning at the waypoint; if the turning angle is smaller than the comparison value, setting coordinated turning at the waypoint; re-planning a route, and generating normal turning points and coordinated turning points; and finally, obtaining a power line patrol route of a fixed-wing unmanned aerial vehicle-mounted laser radar. According to the route design, the high-precisionthree-dimensional point cloud information of a power transmission line body and a corridor can be quickly obtained, and the line patrol efficiency and the patrol precision can be greatly improved. Through coordinated turning in a place with a large tower line turning angle, line patrol is not influenced by the turning posture of an airplane, and it is guaranteed that point cloud data can be completely and uniformly acquired and an effective three-dimensional patrol channel can be constructed under a complex line patrol condition.