Nano-self-cleaning glass has developed the preparation technology of nano-self-cleaning coatings cured at room temperature and pressure. The glass surface is coated with nano self-cleaning coating. After the film on the glass surface is irradiated by the sun, the organic pollutants on the surface are degraded, and after being washed by rain (water), a hydrophilic film is formed on the surface of the glass film, leaving no water mark, and inorganic pollutants such as dust are easily washed away, thus achieving the effect of cleaning the surface. Nano-self-cleaning glass not only has high photocatalytic activity and super hydrophilicity, but also has antireflection effect. At present, there is no patent report on the key technology of on-line and off-line spraying film formation at room temperature. In addition to cleaning function, nano self-cleaning glass can also sterilize and purify the air. Nano-self-cleaning glass has been tested by National Building Materials Testing Center: its service life is long, and there is no change after 2000 hours of artificial aging test, that is, the actual service life will exceed 10 years, which can fully meet the actual needs of the glass industry; Acid resistance: soaked in 5% sulfuric acid for 48 hours, the surface has no change; Alkali resistance: saturated calcium hydroxide soaked for 48 hours, the surface has no change; Hardness: 0.95, similar to glass substrate; Adhesion: grid method grade 0, good adhesion.