The paint film of the polyurea elastic weather-resistant topcoat does not contain photochromic and chromogenic groups, which can completely avoid the shortcomings of aromatic isocyanate polymers that are not resistant to ultraviolet rays and are prone to yellowing. It has the advantages of high gloss, good wear resistance, and resistance to yellowing. The paint film is bright and full, has good light retention, color retention and weather resistance, and has excellent resistance to water, oil and chemical solvents.