The present invention discloses a method and system of intelligent management of a power distribution network cascading switching stations. The main technical scheme of the invention comprises at least two switching stations, and optical fiber ring networks are arranged between the switching stations; and each switching station is provided with one fault processing terminal, each fault processing terminal is connected with one optical fiber ring network through an Ethernet switch, each fault processing terminal is connected with a communication server, and all the communication servers are connected with a distribution master station. According to the invention, the ideas of differential protection and direction protection of circuit optical fibers are introduced in the fault processing of the power distribution network, and a system of intelligent management of power distribution network cascading switching stations is formed according to the power supply relation. Rapid communication between terminals is performed through a unit network, and fault signals are only transmitted, therefore the selection of protective actions when feeders have faults is solved through autonomous consultation, and one-time fault isolation is realized.