The invention relates to a ground fault positioning method for a 10KV low voltage distribution network. The method comprises the following steps: injecting an S measurement signal to a fault line via a bus PT in the 10KV low voltage distribution network, measuring the current value of each phase line in three phase lines on two sides of the injection point by using a clip-on ammeter, and judging the direction of a ground point and a ground phase according to whether the three phases of current are balanced; judging whether the current of the maximum phase is more than 37.3mA, positioning a fault by adopting a noncontact measurement device if the current is more than 37.3mA, measuring the fault in the ground direction from the injection point, seeking a reference position where the current break variable is 17.5mA in the line via the noncontact measurement device, and accurately determining a ground fault point in the opposite direction using the reference position as a backtracking point via direct search, climbing rod measurement or the like. The method reduces the working content of climbing rod measurement and the like, reduces the fault positioning work strength, and improves the positioning efficiency; in practical application, about 90% of ground faults can be quickly positioned by using the method; and the method is low in work strength and low in work risk degree.