The invention discloses a film coating method for photovoltaic self-cleaning glass. The film coating method includes: mixing a certain amount of tetrabutyl titanate, sodium octadecanoate and anhydrousethanol, coating the surface of cleaned glass with the mixture, and performing high-temperature integrated calcination to form a nano-structure TiO2 film on the surface of the glass. The film coatingmethod has the advantages that the method is simple to operate, convenient to use and good in coating effect, and the film is good in adhesion; compared the existing solution-gel technology, the hotdispersion effect based on high temperature allows the nano TiO2 to be good in uniform dispersity; the TiO2 structure is good in stability after high-temperature treatment; the coating process does not need a purification chamber and atmosphere protection; by the light-induced super-hydrophilicity and photocatalysis feature of the nano TiO2 film, a water film is formed on the surface of the glassto prevent pollutant adhesion and degrade organic pollutants, and self-cleaning is achieved; when the coated finished product is applied to a photovoltaic power plant, the operation and maintenance manpower cost of the power plant is lowered effectively, the power generation system of the power plant is high in efficiency, and the efficiency can be additionally increased by about 2-5%.