The present invention provides a water-based gloss topcoat. The water-based gloss topcoat comprises a component A and a component B; the component A comprises, by weight, 50-110 parts of waterborne hydroxy acrylic resin, 3-6 parts of a cosolvent, 0.2-0.5 part of a wetting agent, 0.2-0.5 part of an antifoaming agent, 0.2-0.6 part of a thickener, 0.3-0.5 part of a mildew inhibitor, 0-25 parts of a color paste, and water; and the component B comprises, by weight, 60-110 parts of hydrophilic modified isophorone diisocyanate and hexamethylene diisocyanate, 15-30 parts of propylene glycol methyl ether acetate and 0.5-2 parts of a water scavenger. The water-based gloss topcoat provided by the invention has the advantages of high brightness, environmental protection, good yellowing resistance, high hardness, high water resistance and high chemical resistance; and the water-based gloss topcoat has high tolerance to the temperature, and can be cured at room temperature without seeds, and a filmformed by the gloss topcoat has high fullness, has almost no dark bubbles, thereby the gloss topcoat is very suitable for the coating production of toilet and bathroom cabinets.