The invention provides a radiation protective paint for a computer and a preparation method of the radiation protective paint. The radiation protective paint is prepared from the following ingredients: an acrylic emulsion, a radiation protective emulsion, methylcellulose, kieselguhr, calcium carbonate, a modified epoxy resin, butyl cellosolve, n-propoxypropanol, pH regulator, a thickener, a dispersing agent and deionized water. The radiation protective paint has the advantages that the storage stability is good, the radiation protective paint is not layered and does not precipitate, the radiation protection effect is obvious, the adhesive force is strong, the cost is low, and the preparation method is simple and is suitable for industrial production and manufacturing on a large scale.