The invention discloses an environment-friendly elastic surface layer hard to change color and a preparation method thereof and relates to the field of polyurethane materials. The environment-friendlyelastic surface layer hard to change color is prepared from the main raw materials: a polyurethane adhesive, elastic particles and a pigment. By changing the composition of isocyanate, a lot of aliphatic/alicyclic isocyanate monomers and polymers are adopted, so that yellowing of the material is avoided from the source of the polymer structure. As aromatic isocyanate will be oxidized to quinine which is yellow under ultraviolet illumination, the ageing resistance is improved greatly by adding an antioxidant, an ultraviolet absorbent and a light stabilizer. By adopting an environment-friendlycatalyst and a diluent, no harmful and toxic matters in the whole system are prevented from being volatilized, so that toxic running track events are avoided. The key is that residual isocyanate monomers which are not reacted completely are eliminated finally by way of film evaporation, so that the polyurethane adhesive is safer and more environment-friendly.