911 polyurethane waterproof coating is composed of a polyurethane prepolymer containing an isocyanate group (-NCO) (component A) and a mixture of additives containing a polyhydroxy group (-OH) solidifier (component B) with plasticizers, tackifiers, antifungal agents, diluents and other additives. The two-component components are mixed evenly in a certain proportion, and after curing, they form a uniform, elastic and waterproof overall waterproof adhesive film.