The invention discloses an anti-sagging quick-drying two-component polyurethane waterproof paint, which comprises a component A and a component B. The weight ratio of the component A to the componentB is (1: 1)-(1: 2), and the component A is mainly prepared from polytetrahydrofuran ether glycol, aliphatic isocyanate, a plasticizer, a chain extender and a catalyst A; and the component B is mainlyprepared from ethylene diamine polyether, polyaspartate polyurea resin, a plasticizer, carbon black, a catalyst B, an inorganic filler, a thixotropic agent and other assistants. The preparation methodcomprises the following steps: carrying out vacuum dehydration on polytetrahydrofuran ether glycol, cooling, and adding other components to prepare the component A; uniformly dispersing ethylene diamine polyether and polyaspartic acid ester polyurea resin, adding other components, and grinding to obtain the component B; the waterproof paint is an aliphatic polyurethane waterproof paint, a concrete protective layer is not needed in waterproof layer construction, the waterproof paint can be directly exposed, meanwhile, a concrete protective layer is not needed, the sagging resistance value of the waterproof paint is 500 [mu]m or above, surface drying and hard drying are fast, and the product maintenance period is shortened.