In order to solve the problem that there is a large deviation between the detected fault location and the actual location in the original fault location system, the research on the fault location system for grounding fault of wind farm collector line based on PSCAD/EMTDC is proposed. A fault location system framework is constructed, a pulse signal is received, a non-contact sensor voltage division unit is designed, and a fault signal is converted; a location process is set based on PSCAD/EMTDC, data information of a fault point is obtained, a measurement distance is given through minimum resolution, and the distance of a grounding fault point of a power collecting line is measured. The experimental results show that the system can measure the signal energy of different distance grounding fault points, ensure the accuracy of fault location, reduce the error of fault location, and has application value.