The invention discloses antirust paint used for a boat bottom. The antirust paint is prepared from following raw materials in parts by weight: 12-15 of an amino resin, 2-3 of zinc powder, 1-2 of nano silicon carbide, 1-2 of phosphoric acid, 70-75 of an E-12 epoxy resin, 7-9 of aluminium triphosphate, 4-5 of butanol, 12-14 of an E-42 epoxy resin, 2-3 of tert-butyl hydroperoxide, 6-8 of zinc oxide, 6-9 of bistetradecanol ester, 15-19 of ethyl acetate, and 3-4 of a film-forming resin. The antirust paint comprises the film-forming resin in the formula, thus improving compatibility of each component and improving the film-forming effect. Paint film obtained by using the antirust paint has excellent adhesive force and impact resistance, and good wear resistance, oil resistance, solvent resistance, water proofness, brine resistance and adhesion force between layers.