The invention provides an anticorrosive paint used in waste gas treatment equipment and a preparation method thereof, and relates to the technical field of anticorrosive materials. The anticorrosive paint comprises the following raw materials in parts by weight: acrylic acid, n-butyl acetate, N-methyl pyrrolidone, VAE emulsion, laurinol polyoxyethylene ether, acetone, palygorskite, lithium-based bentonite, nanometer silica, nanometer titania, ethylene glycol monomethyl ether, polyurethane, graphite, talcum powder, acetylacetone, a thickener, a flatting agent, a phenol antioxidant and a compatilizer; the preparation method comprises the following steps: (1) weighing the raw materials; (2) preparing a base material; (3) preparing a mixed nanometer material; (4) preparing the modifier; (5) mixing, stirring, cooling and packaging. The anticorrosive paint overcomes the disadvantages that the anticorrosive base treatment requirement is high, the coating is too thick and is easy to crack, thepaint film is greatly influenced by temperature and humidity during curing, the curing time is long and the paint is low in weather resistance and not high in adhesive property existing in the anticorrosive paint used in the waste gas treatment equipment in the prior art.