Spraying plastic polyurethane composition as well as preparation method and application thereof

The invention discloses a spraying plastic polyurethane composition comprising a polyalcohol component A and an isocyanate performed polymer component B, wherein the component A is polyalcohol mixture comprising the following components in parts by weight: 100 parts of polyalcohol, 5-30 parts of chain extender, 1.5-3.5 parts of non-volatile catalyst, 0.05-5 parts of reactive antifoaming agent and 0-5 parts of color paste; the component B is an isocyanate performed polymer formed by the polyreaction of methyl diphenylene diisocyanate and the polyalcohol with the molecular weight of 1000 to 8000 according to a ratio by weight of 100: (5 to 80), and the NCO content is 15-30 percent by weight; and the component A and the component B are separately stored and are matched according to the ratio by weight of 100:30 to 100:110 when in use. The invention discloses a preparation method of the spraying plastic polyurethane composition and an application thereof in manufacturing interior decorations of vehicles.