The invention discloses a UAV path planning method for an electromagnetic interference environment, and the method can be used to obtain a globally optimal path rapidly. Update of information elements of an ant colony algorithm serves as a point of penetration, the global and searching capabilities of the ant colony algorithm are improved by updating the global and local information elements in the ant colony optimization searching process, the searching speed for the globally optimal path of the algorithm is improved, a new path can be generated rapidly according to new work nodes, real-time path planning of a UAV can be realized, and it is proved that when the method is used to resolve a given object point, generation of an initial track needs 353ms, generation of a new track by changing track points needs 261ms, and rapid track searching and computing are suitable for real-time UAV line-patrol path planning in the real environment. The UAV path planning method can be popularized and applied in the technical field of UAV.