Xanthochromia-resistant UV paint for external wall sheet material and preparation method of xanthochromia-resistant UV paint

The invention provides a xanthochromia-resistant UV paint for an external wall sheet material, and a preparation method of the xanthochromia-resistant UV paint, wherein the xanthochromia-resistant UV paint has the properties of good water resistance, good alkali resistance, good washing resistance and good xanthochromia resistance. The xanthochromia-resistant UV paint for the external wall sheet material, disclosed by the invention, consists of the following raw materials in percentage by weight: 30%-40% of an aliphat polyurethane acrylic ester,10%-20% of an acrylic ester,10%-30% of a reactive diluent, 3%-6% of a photoinitiator, 0.1%-2% of a light stabilizer, 0.5%-2% of an auxiliary, and 10%-20% of a mixed solvent. The aliphat polyurethane acrylic ester adopts the polyurethane acrylic ester of which the functionality is 2-4; the acrylic ester is the pure acrylic ester.