Due to the poor interception effect of pollutants in existing technologies，an applied research on the ultrafiltration-reverse osmosis dual-membrane method in wastewater treatment of thermal power plants is carried out. First，a submerged Polyvinylidene Fluoride(PVDF) hollow fiber ultrafiltration membrane is adopted to remove suspended solids and macromolecular organic matters in wastewater，and the membrane flux is maintained through an automatic backwashing program. Second，a reverse osmosis membrane is used to conduct deep desalination at a cross-flow velocity of 1.8 L/min，and membrane modification technology is combined to improve the desalination efficiency. Finally，the produced water is disinfectedwith sodium hypochlorite and adjusted by calcium carbonate mineralization to achieve qualified water quality and resourceutilization. Test results show that the ultrafiltration membrane intercepts pollutants efficiently and stably，effectively intercepts organic pollutants such as humic acids and proteins in water，and exhibits favorable treatment effects on different types of pollutants. After hydraulic backwashing，the minimum resistance of the ultrafiltration membrane remains at the level of 2×1012 m.1， and the resistance decreases significantly，which improves the filtration efficiency.