The invention relates to a roof waterproof coating. The roof waterproof coating is characterized by being prepared from the following raw materials in parts by weight: 30-50 parts of an acrylic ester emulsion, 20-30 parts of dimethylamino propylamine, 10-20 parts of ammonium metavanadate, 15-25 parts of potassium bisulfate, 10-20 parts of co-sebacic acid propylene glycol ester, 8-15 parts of triethanolamine, 10-20 parts of vermiculite powder, 8-16 parts of tetrabutylammonium bromide, 6-10 parts of a preservative, 6-10 parts of an antifoaming agent, 10-20 parts of kaolin and 10-20 parts of quartz powder. Compared with an existing waterproof coating, the roof waterproof coating disclosed by the invention is high in water resistance and waterproof property, high in tensile strength, healthy and environment friendly, so that environmental pollution is reduced, and peeling of a wall caused by washing of rainwater after being used for a long time is avoided; the roof waterproof coating can prevent washing of acid rain, because a coating film of the roof waterproof coating will not peel after the roof waterproof coating is washed by the rainwater, so that the probability of penetration of the rainwater into a wall and corrosion of the wall and a loss is reduced.