The shortage of water sources and its pollution has become a major threat affecting people’s lives and production, while the gradually increasing industrial water consumption and unreasonable irrigation is worsening the situation of China’s water resources. Under such circumstance, how to design a self-controllable automatic watersaving system and improve water efficiency is an important issue that needed to be addressed urgently. In this article, the basis technology and processes of the water-saving system is presented. Meanwhile, the advanced control technology is adopted to design the PLC control based water-saving control system specific to the problems existed in china’s industrial water consumption and farmland irrigation, so as to realize automatic control of available water resources. The technology can be used in sewage treatment to strengthen system stability, improve water efficiency and reduce labor intensity.