The invention provides a distribution network fault judgment searching and positioning system which belongs to the technical field of power engineering. A data acquisition device of the system is used for acquiring the state information of a distribution network, and transmitting the state information of the distribution network to a main station database server through a dedicated power communication network. GIS is used for storing and updating geographic information. PMIS is used for storing and updating the parameter information of a transformer and a transmission line. A fault judgment system server is used for providing the functions of fault information retrieval, fault diagnosis, data management analysis, graph processing and information dissemination. According to the invention, distribution network power cut and transmission information query retrieval, failed equipment searching and positioning and online graph display can be carried out; when the distribution network is failed, the system can help emergency repair staff to carry out quick fault point positioning and fault judgment; outage time is effectively shortened; outage range is prevented from expanding; valuable repair time is saved; and the system is fast, flexible and accurate.