Abstract: Characteristics of mine distribution network and difficulties of singlephase grounding fault line selection and location were analyzed. A new type of singlephase grounding fault line selection and location method for mine distribution network was proposed which was based on intermediate frequency signal injecting type. Through monitoring device of mine distribution network to detect fault occurrence time, intermediate frequency signal injecting device starts to inject intermediate frequency signal at the same time. Fault line selection and fault location are realized by analyzing power frequency fault signal and the intermediate frequency fault signal when distribution network parameters are known. Through Matlab/Simulink modeling, simulation analysis and corresponding data analysis and calculation, feasibility and correctness of the method are verified.