With strong coupling between cable and power grid, cables fault may affect the safe and stable operation of the whole power grid and its devices. Only irreversible fault of cable can be detected and located via traditional time domain reflectometry, which cannot meet the development trend and requirements of intelligent detection technology to detect and prevent faults in advance. The traditional frequency domain reflectometry can detect weaker fault, and these so called defects will deteriorate to irreversible fault with time goes by. However, there are still shortcomings in frequency domain reflectometry, such as the misjudged points, shield band in location diagram, and lower locating accuracy. For improving the capabilities of cable fault detection and location, a novel method based on the combination of extended kurtosis and frequency domain reflectometry is proposed in this paper, which can decrease the misjudged point significantly and increase the locating accuracy at higher bandwidth. Finally, the high accuracy and high distinguishability in locating diagram is implemented.