The invention discloses air purification anti-corrosion coating for a wood inner door and a preparation method thereof. The coating is prepared from the following raw materials in parts by weight: 25to 30 parts of polyacrylic resin, 18 to 23 parts of epoxy resin, 12 to 18 parts of organosiloxane resin, 8 to 16 parts of barium sulfate, 5 to 12 parts of talcum powder, 5 to 8 parts of kieselguhr, 4.5 to 8.5 parts of bamboo charcoal powder, 2.8 to 4.5 parts of negative ion powder, 3 to 5 parts of artemisia leaf powder, 2.8 to 4.2 parts of mint herb essential oil, 4 to 7 parts of wood fiber, 3 to6 parts of nano-zinc oxide, 3 to 6 parts of nanometer magnesia, 3 to 6 parts of nanometer titanium dioxide, 2.2 to 3.6 parts of lithium carbonate, 1.2 to 1.8 parts of pigments, 2.5 to 3.6 parts of mildew preventives, 2.2 to 3.5 parts of antioxidants and the like. The coating has the advantages of good anti-corrosion performance, high bonding performance, falling difficulty, good coating performance, good anti-aging performance, difficult cracking and air purification function.