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The design of the busbar wiring is complicated, inefficient, and time-consuming. The research summarizes the constraints and optimization objectives of busbar wiring design in engineering. A busbar routing path planning algorithm based on rapidly-exploring random trees algorithm (RRT*) is proposed. To refine the initial path, on the basis of the traditional RRT* algorithm, the extension method of the generated path to the random point is changed by introducing the intermediate point (corner point), the generated path satisfy the tendency of the busbar. At the same time, a greedy optimization strategy is adopted in the path generation process to obtain a path that uses the least amount of elbows and satisfies the constraints. The simulation results show that compared with the traditional RRT* path planning algorithm, the proposed algorithm can meet the busbar wiring requirements well and provide a new method for the busbar automatic routing problem.