This solar-powered nitrate ion sensor operates on self-sustaining photovoltaic power, requiring no external power supply or wiring, and is suitable for various outdoor water environment monitoring scenarios. It features high detection accuracy and fast response speed, enabling real-time and precise collection of nitrate ion concentration data in water. With stable operation and low power consumption, it is widely used in aquaculture, rivers, lakes, municipal sewage, field water environments and other fields. Its integrated design allows for easy installation and supports long-term uninterrupted online monitoring, facilitating water quality control and environmental monitoring.