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This application provides a water-based paint, its preparation method, an automotive coating, and an automobile. By weight, it comprises the following components: 5-30 parts of a water-based polyester-modified acrylic resin secondary dispersion, 20-50 parts of a water-based hydroxyl acrylic resin secondary dispersion, 5-15 parts of a water-soluble acrylic resin, 5-15 parts of an acrylic-modified polyester dispersion, 8-13 parts of an amino resin, 1-2 parts of a dispersant, 2-6 parts of an additive, 5-20 parts of a pigment, 1-5 parts of a solvent, and 15-25 parts of water; wherein the hydroxyl content in the solution of the water-based hydroxyl acrylic resin secondary dispersion is 2.5%-5% by weight, and the hydroxyl content in the solution of the water-based polyester-modified acrylic resin secondary dispersion is 3%-5% by weight. The water-based paint of this application, with its components working synergistically, produces a water-based color paste with excellent hardness, gloss, and resistance to gasoline, water, damp heat, and salt spray.