The invention discloses a rain-imprint-resistant elastic coating and a preparation method thereof, relates to the technical field of petrochemical elastic coatings, and solves the problem that brightspots are easily formed on the prior elastic coating. The composition consists of the following raw materials in parts by weight: 15-20 parts of water, 30-40 parts of an elastic emulsion, 0.3-0.8 partof a film-forming auxiliary agent, 0.1-0.3 part of a wetting agent, 0.1-0.3 part of a pH regulator, 0.3-0.5 part of a defoaming agent, 0.5-1 part of a dispersant, 1-1.5 parts of an anti-freezing agent, 0.1-0.3 part of an antiseptic bactericidal agent, 35-45 parts of pigment and filler, and 0.8-1.5 parts of a thickening agent. The preparation method of the rain-imprint-resistant elastic coating comprises the following steps: (1) carrying out weighing according to the weight; (2) adding a part of the water in the step (1) into a material barrel of a high-speed dispersion machine for stirring, sequentially adding the wetting agent, the dispersing agent, the defoaming agent, the pH regulator, the antiseptic agent and the pigment and filler, carrying out uniform mixing, and then grinding the obtained slurry to 60-micron fineness; and (3) adding the remaining water in the step (2), the elastic emulsion, the defoaming agent, the antiseptic bactericidal agent, the film-forming auxiliary agent, the anti-freezing agent and the thickening agent in the ground slurry, and carrying out uniform mixing.