Abstract: This paper aims to solve the problems of heavy workload and difficult fault location in traditional methods for detecting leakage faults in power distribution areas, and to improve the power supply service level and power supply quality of the distribution network. To this end, an intelligent online monitoring technology for residual current in power distribution areas based on distributed intelligent monitoring terminals is proposed. By deploying intelligent monitoring terminals across the entire area, residual current data is collected in real-time, and a high-precision synchronous timing is achieved using the Beidou + GPS timing module to ensure the accuracy and consistency of the data. With the help of the distributed residual current intelligent monitoring platform on Alibaba Cloud for data management and analysis, accurate location and real-time monitoring of sudden residual current events are realized. Field pilot application verification shows that this technical solution can significantly improve the efficiency of monitoring, locating, and handling leakage faults, and effectively enhance the safety and reliability of power supply in the distribution network.