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Aiming at the key challenge of maintaining large-scale aging power cable network, the physical model of signal transmission in power cable was described in detail, and the fault characteristics of reflected signal and transmitted signal were extracted. The fault diagnosis method of power cable network based on time domain reflection method was studied to realize the rapid identification and location of cable network faults. Taking the minimum unit Y-type cable network as the research object and establishing its physical model, the signal propagation path and impedance mismatch information reflected by the reflected signal and transmitted signal between the measuring points in the distributed detection were used to study the cable fault diagnosis method based on multi-source information fusion. A fault simulation model of Y-type cable network was built in Matlab/Simulink software environment. The effectiveness and scope of application of the method were verified by the simulation experiments of different trunk and branch lines.