An anticorrosive coating used on the inner wall of a desulfurization and denitrification device comprises a main paint component A and a curing agent component B. The main paint component A comprises, by weight, epoxy resin, phenolic resin, nano-silicon dioxide, diatomite, ceramic micro-powder, glass powder, carbon black, a dispersing agent, a flatting agent, a defoaming agent, barium sulfate, an antirust agent, a 1# solvent, graphene nano-platelet powder and activated carbon. The curing agent component B comprises, by weight, a modified amine hardener and a 2# solvent. The weight ratio of the component A to the component B is 3.5-4.5:1. The anticorrosive coating is used for corrosion prevention of the inner wall of a dust remover of the desulfurization and denitrification device, is convenient to apply, corrosion of highly corrosive flue gas (such as SO<2>, NO<x>, HF and HCl) to the steel inner wall is effectively prevented, corrosion of highly corrosive liquid (such as H<2>SO<4>, HCl and HF) is effectively prevented, and meanwhile a paint film formed by the anticorrosive coating has very high abrasion resistance, temperature endurance and cold and hot shock resistance.