The invention provides a preparation method and application of a selenium-enriched cadmium-resistant foliar fertilizer special for rice .The preparation method of the selenium-enriched cadmium-resistant foliar fertilizer special for the rice comprises the following steps that sodium selenite, zinc sulfate, manganese sulfate and ferrous sulfate are dissolved in water and prepared into an original mother liquid, wherein the concentration of sodium selenite ranges from 30 g/l to 60 g/l; the original mother liquid is mixed with an amino acid solution of which the mass concentration ranges from 15% to 20%, shaking chelating is conducted, and a chelating liquid is obtained; the chelating liquid and a single silicic acid aqueous solution are mixed to be uniform to be prepared into a mixed liquid; sodium alkyl benzene sulfonate is added, the mixture and filtrate obtained through saccharose alcohol fermentation are stirred at 25 DEG C to 35 DEG C for secondary chelating, and the selenium-enriched cadmium-resistant foliar fertilizer special for the rice is obtained .By means of the preparation method and application of the selenium-enriched cadmium-resistant foliar fertilizer special for the rice, 90% or above of inorganic selenium is converted into organic selenium such as selenomethionine and selenocystine, the poisoning risk is eliminated, the absorption conversion rate of selenium is increased, the raw material amount is reduced, the cost is reduced, and the rice has a good cadmium-resistant property.