The invention relates to a high-efficiency and high-reliability fault processing method aiming at a complex power distribution network. The method includes steps of (1) improving communication quality, (2) processing correctness of data, (3) determining maintenance conditions of a model, (4) finishing the available rate of a fault processing function, (5) processing conditions of a secondary device, and (6) processing conditions of a primary device. According to the inventions, practical verification tools are used for daily inspection on base indexes, auxiliary verification tools are added, fault analysis algorithm is improved, and the reliability is raised through an operation management method of an innovation system; and a concrete implementation scheme for raising the reliability of an FA function is a base method for safely operating a power distribution network, the reliability of a feeder automation function is raised so that a higher practical requirement of the feeder automation function is achieved.