The invention discloses mold-preventive biological emulsion paint. The mold-preventive biological emulsion paint is prepared from the following substances in parts by mass: 30 to 40 parts of polyvinylacetate emulsion, 20 to 25 parts of deionized water, 0.8 to 1.2 parts of a dispersion agent, 2 to 3 parts of a defoaming agent, 0.1 to 0.2 parts of an anticorrosion sterilizing agent, 6 to 8 parts ofshell powder, 15 to 25 parts of folium artemisiae argyi powder, 0.2 to 0.3 part of hydroxyethyl cellulose, 15 to 20 parts of a filling material, 0.1 to 0.2 part of a thickening agent, and 6 to 10 parts of a film-forming agent. The polyvinyl acetate is used as the emulsion, the polyvinyl acetate emulsion has the advantages of high adhesion, high hydrophilic performance, rapidness in drying, good waterproof performance, environmental friendliness and the like, the two pure natural animal and plant raw materials of the shell powder and the folium artemisiae argyi powder are added in the emulsion, so that on one hand, the production cost of the biological emulsion paint can be reduced; and on the other hand, the mold-preventive capability of the emulsion paint can be improved, and the mosquitoes in a painting room can also be reduced.