The invention discloses furan resin loaded nano ceramic modified molding sand. The furan resin loaded nano ceramic modified molding sand is characterized by comprising the components, by weight, 50-70parts of silica sand, 40-50 parts of quartz sand, 2-5 parts of manganese sand, 3-6 parts of white marble sand, 3-5 parts of glass sand, 3-6 parts of emery, 1-3 parts of borax, 2-4 parts of rare earthporcelain sand, 4-8 parts of coal ash, 5-10 parts of triethoxy-2-furan silane modified nano ceramic powder, 6-9 parts of furan resin, 4-7 parts of epoxidized polyurethane/2,5-di(aminomethyl) furan polycondensate, 2-4 parts of hyperbranched epoxy resin and 25-35 parts of water. The invention also discloses a preparation method of the furan resin loaded nano ceramic modified molding sand. The furanresin loaded nano ceramic modified molding sand has the advantages of being good in air permeability, flowability, and dispersibility, high in strength, good in heat resistance, excellent in comprehensive performance, smooth in casting surface, not prone to falling out, and capable of being recycled and reused.