The invention discloses a water-based melamine acrylic coating and a preparation method thereof. According to the raw material addition sequence, various auxiliaries can have the best efficacy while it is ensured that film forming matters are evenly dispersed, and finally a uniform and stable system is formed. According to the water-based melamine acrylic coating, by researching the water-based coating, on the premise that various performances of the coating are achieved, the problem that the coating is slow in curing and high in release quantity is effectively solved, the production cost is lowered to the maximum extent, guarantees are provided for increasing the yield and improving the quality of enterprises, the water-based melamine acrylic coating prepared by adopting the method has the advantages of being good in environment-friendliess and high in adhesion capability, the market potential is huge, and the prospect is wide.