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In the power supply system fault of rail transit, cable fault is a common fault, while in the traditional power system, cable fault location technology mainly completes the fault location work through off-line location, resulting in high false alarm rate of cable fault location. In the power supply system fault of rail transit, cable fault is a common fault, while in the traditional power system, cable fault location technology mainly completes the fault location work through off-line location, resulting in high false alarm rate of cable fault location. For this reason, a new on-line cable fault location technology for rail transit power supply system is designed. Using the formula of Fourier transform, the voltage pulse of power supply system is collected and the abnormal pulse is recorded. According to the abnormal pulse analysis results and the change of the conductor data of the power supply system, the cable fault category is determined. According to the result of cable fault classification, the distance between the fault point and the cable end point is calculated by traveling wave calculation method to complete the cable fault location. Set the maximum value of cable fault location error and the realization platform of fault location technology to complete high-precision cable fault location. The experimental structure shows that the false alarm rate of this fault location technology is lower than that of traditional location technology and other design methods. It can be seen that the positioning ability of this method is better and the use effect is better.