With the rapid development of industrial automation, the scale and complexity of transmission lines are increasing, which puts forward higher requirements for transmission line inspection and maintenance. To solve this problem, a multi-objective point path planning method based on optimized RRT algorithm is proposed. The sampling efficiency is improved by adopting target orientation and dynamic elliptic constraint domain, and the path is smoothed by cubic spline interpolation curve. The obb bounding box method is introduced to simplify the obstacle model in complex transmission line environment, so as to improve the collision detection efficiency. Simulation results show that compared with the traditional RRT algorithm and RRT* algorithm, the improved RRT algorithm can increase the planning time by 65%~71%, reduce the sampling points by 67%~79%, and shorten the path length by 42%~47%, which improves the efficiency and quality of multi-objective point path planning in complex electric transmission line environment.