This paper presents an energy-savingnano-photocatalyst sterilization device. The mainconstruction adopts circular wind air duct system toproduce electricity. Through illuminating the filtermaterial with LED, it can have bactericidal function.High quality air can therefore be obtained. Electricalpower is generated by a wind power generation device.Electrical power is obtained by applying air flow andfan rotation. Therefore, UV light source withbactericidal function is obtained. This device uses UVlight to illuminate titanium dioxide (TiO2) coated filters.The chemical reaction results in bactericidal function inthe air. It not only prevents bacteria from growing butalso filters air and eliminates contaminants in the air. Itcan also be effective in purifying indoor air quality. Tomeet the needs of energy saving, this device needs not bepowered by general electrical power. It not onlyeliminates bacteria but also saves energy. Indeed, it is anecessity in family life.