With the accelerated pace of national modernization, the issue of sewage discharge in urban and rural industrial parks has attracted more and more attention. Disorderly discharge of industrial sewage by some enterprises has seriously damaged the urban and rural environment. This paper realizes the real-time monitoring of the water quality of the water outlet. In order to realize this system, firstly design a three-dimensional model of a hydroelectric power plant and simulate the water pressure of the turbine, use the GPRS module and STM32 main control chip to control the electric ball valve, and control the electric ball valve through the single-chip microcomputer to block the sewage in time. The high-level wind power generation in the plant is used to generate electricity for the cloud platform server, the GPRS module is used to upload data to the cloud platform, and the BDS positioning module is used to achieve real-time and accurate water quality monitoring in urban and rural industrial parks.