NOVELTY - Antireflective optical conversion coating comprises 25-50% of 5% alkali nano-silicon dioxide aqueous sol (average particle diameter of 20 nm), 10-25% of 5% acidic nano-silicon dioxide aqueous sol (average particle diameter of 10 nm), 5-15% bismuth-terbium doped 5% nano titanium dioxide hydrosol (average particle diameter of 10 nm), 0.2-0.5% ammonium nitrate, 0.1-0.5% nitric acid, 0.5-2% of 5% aqueous surfactant solution, 0.5-2% of 5% aqueous coupling agent solution and deionized water (remaining amount).    USE - The coating is useful for solar cell glass (claimed).    ADVANTAGE - The coating: has photocatalytic properties in the UV and visible light region of solar spectrum; has good antireflective effect when coated on the solar cell glass and has light transmittance rate of 93.9-94.5% after curing at 80-180 degrees C; has light transmittance rate of 94.7-95.3%, when coated on glass-steel; has good self-cleaning effect, forms water contact angle of 5-10 degrees , has film surface resistance of 108, has oleic acid film surface degradation efficiency of 90-95%; and has oleic acid film surface degradation efficiency of 60-75% after irradiating with UV for 1 hour (all claimed).    DETAILED DESCRIPTION - Antireflective optical conversion coating comprises 25-50% of 5% alkali nano-silicon dioxide aqueous sol (average particle diameter of 20 nm), 10-25% of 5% acidic nano-silicon dioxide aqueous sol (average particle diameter of 10 nm), 5-15% bismuth-terbium doped 5% nano titanium dioxide hydrosol (average particle diameter of 10 nm), 0.2-0.5% ammonium nitrate, 0.1-0.5% nitric acid, 0.5-2% of 5% aqueous surfactant solution, 0.5-2% of 5% aqueous coupling agent solution and deionized water (remaining amount). An INDEPENDENT CLAIM is also included for producing the antireflective optical conversion coating, comprising (i) carrying out alkali hydrolysis of ethyl silicate in an aqueous solution of ethanol, where the raw material comprises 99% ethyl silicate, 94% ethanol, deionized water and 25% concentrated aqueous ammonia in a molar ratio of 1:2-4:0.5-1:0.01-0.05, adding deionized water after completion of the hydrolysis reaction, vacuum distilling and separating ethanol at 60-65 degrees C to obtain 5% alkali nano-silicon dioxide aqueous sol (average particle diameter of 20 nm); (ii) carrying out acid hydrolysis of ethyl silicate in aqueous solution of ethanol, where the raw material comprises 99% ethyl silicate, 94% ethanol, deionized water, and 20% dilute nitric acid in a molar ratio of 1:2-4:0.5-1:0.01-0.05, adding deionized water after completion of hydrolysis reaction, vacuum distilling and separating ethanol at 60-65 degrees C to obtain 5% acidic nano-silicon dioxide aqueous sol (average particle diameter of 10 nm); (iii) mixing 5% alkali nano-silicon dioxide aqueous sol and 5% acidic nano-silicon dioxide aqueous sol in a mass ratio of 1:0.2-0.5, stirring the mixture for 0.5-2 hours, and adjusting the pH of the mixture to 2-2.5 by adding 20% dilute nitric acid to obtain silicon dioxide antireflective hydrosol; (iv) stirring and adding bismuth-terbium doped titanium dioxide hydrosol into silicon dioxide antireflective hydrosol in a mass ratio of 1:0.005-0.2, adjusting pH to 4-6 by adding 10% dilute aqueous ammonia to the obtained mixed hydrosol, stirring the mixture for 0.5-1 hour, copolymerizing nano silicon dioxide hydrosol and bismuth-terbium doped titanium oxide hydrosol, and adjusting the pH of the mixed hydrosol to 1.8-2.5 by adding 20% dilute nitric acid solution when the degree of water soluble adhesive begins to increase, and obtaining stable self-cleaning antireflective optical conversion hydrosol; and (v) adding a surfactant, coupling agent, and deionized water into the obtained antireflective optical conversion hydrosol, stirring the mixture, and aging the mixture for 8-12 hours to obtain 2-5% solid content coating.