To accurately and quickly locate the fault of underground cables of the distribution network and realize the fault isolation and the self-healing control of the distribution network, a fault self-healing control strategy for the distribution network based on the zero-sequence current injection method is proposed. First, a distributed zero-sequence current carrier signal is injected into the cable network, and the carrier signal is transmitted to the substation through the cable. At the substation, the signal is processed, and its characteristics are analyzed to quickly identify the faulty line and locate the fault. This enables timely fault isolation, contributing to the self-healing process for the distribution network. The signal injection device does not require an external power supply, making it easy and cost-effective to install around underground power cables and handle cable network faults. Finally, a numerical simulation is performed on MATLAB, validating the effectiveness of the proposed method.