The invention relates to a heuristic fault positioning method for a next generation network. The method comprises the following steps that: firstly, observable signs in a network system are assembled together; one or a plurality of faults which are most related to the observable signs are found out; secondly, according to the following phenomenon that the faults just meet to lead and generate allthe signs of an observable sign assembly, the faults are combined to a fault positioning assembly; finally, the faults are judged and positioned by the fault positioning assembly. The method can consider the difficulty and application demand brought by 3G, the next generation network and other new networks, meet the need of real-time fault positioning in a large-scale business network and have high fault detection accuracy, low fault error detection rate, short detection time, rapid fault positioning time and low computational complexity.