The invention provides a power distribution fault processing method and a system and relates to the technical field of power distribution. The system comprises a server, a power supply management terminal and multiple mobile terminals, which communicate with each other. Position information, fault records and newest maintenance time of each power distribution device in a power distribution range are stored in the server. The method comprises steps that the server acquires a power distribution repair work order and finds multiple power distribution circuits where the faulted distribution devices are located, and the fault records and newest maintenance time of each power distribution device in the multiple power distribution circuits, and thereby designates a line patrol range; the server sends a power cut request to the power supply management terminal after designating the line patrol range; the power supply management terminal responds to the power cut request and sends power cut feedback information to the server; and the server receives the power cut feedback information, divides all the power distribution devices in the line patrol range into two groups, generating line patrol task information for inspecting each group of the power distribution devices and issuing the line patrol task information to the different mobile terminals.