The invention discloses a uniform processing method and system of power distribution network faults on the basis of a software defined network. The system comprises the following steps: when a certain site in a power distribution network fails, parts of circuit breakers act according to the information of a flow table in an openflow switch or a command of a controller, in addition, a technology of the software defined network is used for quickly controlling the corresponding circuit breaker through software after faults happen, the topological structure of a local power distribution network is reconstructed, so that a fault area is reduced, and power supply recovery time is shortened. The method comprises the following steps: when an auxiliary transformer substation node fails, firstly, reporting the fault to the openflow switch which manages the transformer substation; if action information of fault recovery is in the presence in the openflow switch, sending an action instruction to the corresponding circuit breaker by the switch; and if no matched processing flow tables can be found for the faults in the openflow switch, executing the following steps.