Abstract: Countryside sewage treatment plants has a lot of problems，such as poor process performance，low dehydration efficiency and weak control system automation.Moreover，effluent quality after waste-water treatment does not meet requirements of current index.In order to solve these problems，based on sewage treatment process，standard raising process scheme of sewage treatment，sludge treatment equipment and intelligent control system of sewage treatment were systematically transformed and designed.To improve effluent standard，original integrated oxidation ditch was transformed into a multistage AO+MBBR treatment process on basis of investigation which was based on analysis of status quo of waste-water treatment.To improve sludge dehydration rate，it was transformed into a diaphragm plate and frame filter press based on original plate and frame filter press.To realize automatic control of waste-water treatment system，original automatic control system was transformed and schematic diagram of automatic control system based on PLC control technology was designed.Compared with traditional waste-water treatment methods，waste-water treatment upgrading project designed improved quality and efficiency of waste-water treatment.Treatment technology and standard were also improved.