The embodiment of the present invention discloses a distribution network fault location method and system based on electric energy quality monitoring data. The method comprises the steps of: obtainingsteady-state voltage and current data through an electric energy quality monitoring device, determining a distribution network fault type according to the steady-state voltage and current data, according to the different distribution network fault types, employing fault recording data collected by the electric energy quality monitoring device to calculate an apparent impedance value when the distribution network faults are calculated, the real resistance values at two ends of a circuit are calculated, the real impedances at the two ends of the circuit and the apparent impedance value are compared to determine a fault circuit, and finally in the determined fault circuit, a method similar to the method of bisection is employed to continuously reduce the range of the fault circuits so as tofinally determine fault points, effectively reduce the fault location section and shorten the fault checking time.