The invention relates to the technical field of water-based paints, and concretely relates to water-based environment-friendly steel drum paint and a preparation method thereof. The steel drum paint comprises, by weight, 20-40 parts of water-based
polyester resin, 10-30 parts of deionized water, 0.5-2 parts of a water-based
defoamer, 1-3 parts of a neutralizer, 10-20 parts of a
pigment filler, 3-5parts of a cosolvent, 5-10 parts of amino resin, 0.5-3 parts of a water-based surface aid, 0.3-0.6 part of a water-based leveling agent, 1-3 parts of an adhesion
promoter and 0.3-1.5 parts of an anti-
settling agent. The preparation method comprises the following steps: sequentially adding the water-based
polyester resin, the water-based
defoamer, the neutralizer, the deionized water and the
pigment filler into a cylinder, stirring, transferring into a sand mill, and
grinding; slowly adding the water-based surface aid, the water-based leveling agent, the adhesion
promoter, the amino resin, thecosolvent and the anti-
settling agent, filtering and packaging. The steel drum paint is good in
constructability, low in VOC, simple in preparation method and capable of well meeting market requirements.