The invention relates to efficient anion water-based inorganic environmental protection coating, characterized by being prepared from the following components in parts by weight: 15-25 parts of silicate aqueous solution, 10-20 parts of silica sol, 5-10 parts of polyvinyl alcohol, 10-15 parts of rare earth oxide, 10-15 parts of tourmaline powder, 10-20 parts of deionized water, 4-5 parts of silanecoupling agent, 1-2 parts of defoamer, 0.5-1 part of flatting agent, 3-5 parts of nano zinc oxide dispersion liquid, 10-20 parts of zinc powder and 2-5 parts of talcum powder. A film forming matter ofthe efficient anionic water-based inorganic environmental protection coating is inorganic silicate, and is environmentally friendly and free of VOC; based on the valence alternation property of unpaired electron of rare earth element 4f track, the electrolytic capability of tourmaline electric field on water molecules in air is enhanced, and anion is efficiently produced; the addition of nano zinc oxide improves the capability of the coating decomposing formaldehyde and purifying air; compared with similar products on the market, the coating is strong in environmental protection and formaldehyde removal capabilities, has good adhesion and corrosion resistance on a metal substrate, and fills the blank of anion coatings on the metal substrate.