In order to meet the high-efficiency and intelligent requirements of environmental monitoring and risk warning of hydropower plants, a set of monitoring and early warning systems is designed. Through the perception of "water, ship, object and person" and other data, the visualization of the water area and the safety of the factories were guaranteed. Intelligent video equipment and AI intelligent analysis platform were used to monitor the key position of the dam in real-time, which reported the situation of water level and velocity, and completed the floating object warning window and intelligent analysis of ships. Based on the intelligent fire protection platform and AR panoramic visualization system, the intelligent reading and alarm linkage of the instrument were realized. The measured results of the smart power plant were consistent with the field survey，which can provide comprehensive data support for water area management and fault identification.