Abstract: Considering the special requirements of power supply in mine coal, we designed a new mine cable fault locating system to improve the precision and speed of fault location. The mine cable fault location system chooses DSP chip TMS320VC5507 as the central processing unit, and can realize the fault location of mine cable quickly and accurately by applying wavelet transformation and singularity detection theory as fault signal processing technology. The simulation results show excellent fault location performance of the system.