This solar powered water quality chloride ion sensor adopts photovoltaic self power supply and low-power design, which can achieve online continuous monitoring of chloride ion concentration in outdoor water bodies without the need for external power supply. Built in high selectivity solid-state chloride ion electrode, stable measurement, strong anti-interference, supports 4G/LoRa wireless transmission and cloud platform alarm. Suitable for seawater intrusion warning, agricultural irrigation water quality control, industrial wastewater discharge, and drinking water safety assessment. Protection level IP68, no wiring installation, significantly reducing maintenance costs, and assisting in the remote monitoring deployment of smart water management and ecological environmental protection.