NOVELTY - Preparation of composite sol includes mixing silanol, water, basic catalyst, and alcohol solvent to form solution A; adjusting pH of solution A; adding inhibitor and dispersant into solution A; aging to obtain first sol; changing the reaction conditions; adding acidic catalyst, inhibitor, and stabilizer into the first sol to form solution B; adjusting pH; adding metal alkoxide or metal salt; aging to obtain second sol; dissolving the second sol, aqueous silane coupling agent, and wetting and leveling agent and coating into the composite environment-friendly solvent; and blending.    USE - Preparation of composite sol for solar battery packaging glass antireflection film (claimed).    ADVANTAGE - The method has simple technique and low cost; and greatly reduces the cost of coating material for coating the antireflection film. The composite sol coating material does not absorb water; and can make the prepared antireflection film retain high light transmission rate.    DETAILED DESCRIPTION - Preparation of composite sol includes:    (A) mixing silanol, water, basic catalyst, and alcohol solvent at 1-100:0.1-10:0.01-1:3-300 volume ratio to form solution A;    (B) adjusting pH of solution A at 8-10;    (C) adding inhibitor and dispersant into solution A; and aging for 1-10 days to obtain first sol;    (D) changing the reaction conditions; adding acidic catalyst, inhibitor, and stabilizer into the first sol to form solution B; and adjusting pH of solution B to 2-5;    (E) adding metal alkoxide or metal salt into solution B; and aging for 5-20 days to obtain second sol, where metal alkoxide is zirconium alkoxide, titanium alkoxide, or aluminum alkoxide, and the metal salt is zirconium salt, titanium salt, or aluminum salt; and    (F) dissolving the second sol, aqueous silane coupling agent, and wetting and leveling agent and coating into the composite environment-friendly solvent; and blending for greater than or equal to 0.5 hour to obtain composite sol.    INDEPENDENT CLAIMS are included for:    (1) composite sol for solar battery packaging glass antireflection film; and    (2) manufacture of solar battery packaging glass including spinning coating, dipping, roller coating, sprinkling, or spray coating the composite sol on glass substrate to form solar battery packaging glass with antireflection film; reinforcing the solar battery packaging glass with antireflection film; and cleaning the solar battery packaging glass with antireflection film to obtain solar battery packaging glass product.