The invention discloses an environment-friendly chromium-free rust-proof passivation solution. The rust-proof passivation solution is prepared from the raw materials of, by weight, 100 parts of deionized water, 2-10 parts of salicylic acid, 4-10 parts of benzotriazole, 3-10 parts of sodium citrate, 2-10 parts of 2-chlorine-4,5-dihydro-1H-imidazole sulfonate, 1-10 parts of hexafluorotitanic acid, 1-5 parts of sodium gluconate, 1-5 parts of zinc oxide, 4-10 parts of cerium nitrate, 3-10 parts of silane-modified polyphosphazene-polyethersulfone block copolymers, 5-10 parts of silver nitrate, 1-10parts of n-butanol, 1-5 parts of sodium silicate, 1-5 parts of 2-mercapto benzimidazole-5-sodium sulfonate dehydrate, 1-10 parts of oxalic acid, 1-5 parts of ethyl alcohol and 1-5 parts of 3-[(methylol)methylamine] ethanesulfonic acid. The obtained environment-friendly chromium-free rust-proof passivation solution can be used for low-temperature surface treatment, is high in surface treatment efficiency, environmentally friendly and good in rust-proof performance and has good market prospects.