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The project "Development of Smart Underground Cable Earth Fault Detection" aims to address the challenges in detecting earth faults in underground cables, which can lead to significant power disruptions. Underground cables are prone to faults such as open circuit, short circuit, and earth faults. The focus of this research is on detecting the location of earth faults by monitoring voltage fluctuations along the cable. A prototype divides the cable into four sections, each with faults at 1m, 2m, 3m, and 4m distances. The ESP32 microcontroller processes the data from sensors and calculates the fault location, which is displayed on an LCD screen. Additionally, the system integrates with a Telegram bot to send real-time fault alerts to technicians, including phase, distance, and location. This solution is cost-effective and scalable, improving the speed of fault detection and maintenance, thereby reducing power outages and equipment damage. Future enhancements include better sensors, GPS, 5G communication, and machine learning for predictive maintenance.