Concrete waterproof coating and preparation method thereof

The invention relates to a concrete waterproof coating and a preparation method thereof. The concrete waterproof coating comprises a powder material and a liquid material, the powder material comprises the following components in parts by weight: 30-40 parts of Portland cement, 20-30 parts of aluminate cement, 3-5 parts of diatomite, 5-10 parts of fly ash, 2-5 parts of calcium carbonate powder, 5-10 parts of quartz powder and 0.01-0.03 part of polyvinyl alcohol fiber; the liquid material comprises the following components in parts by weight: 1-3 parts of a dispersing agent, 2-4 parts of an organic silicon resin solution, 1-2 parts of a water reducing agent, 1-2 parts of a defoaming agent and 10-20 parts of water. According to the concrete waterproof coating disclosed by the invention, through the synergistic effect of the organic silicon resin, powder materials such as the diatomite, the fly ash, the calcium carbonate powder, the quartz powder and the polyvinyl alcohol fibers and other liquid materials, a coa