Abstract: To address the challenges of high workload and difficulty in fault point localization in traditional leakage fault detection methods in power distribution areas, this paper proposes an intelligent online residual current monitoring technology based on smart monitoring terminals. By deploying smart terminals across the entire distribution area, real-time residual current data can be collected. High-precision time synchronization is achieved through integrated BeiDou and GPS modules, ensuring data accuracy and consistency. The collected data is managed and analyzed via a cloud-based residual current monitoring platform on Alibaba Cloud, enabling precise localization and real-time tracking of sudden residual current anomalies. Field pilot tests have demonstrated that this approach significantly enhances the efficiency of leakage fault detection, localization, and response, thereby improving the safety and reliability of power supply in distribution networks.