A modified potassium silicate solution was prepared by the reactant of potassium silicate and silica sol, moderately hydrolyzed silicone-acrylic emulsion which has been catalytic hydrolyzed with tetramethylammonium hydroxide. The water-based inorganic potassium silicate zinc-rich coatings was prepared by organic-inorganic hybridization, which was manufactured by mixing zinc powder into modified potassium silicate solution with a ratio of 1:2.6. In this paper, we investigated the influence of modulus, solid content and the addition of moderately hydrolyzed silica-acrylic emulsion on the properties of waterborne inorganic zinc-rich coatings. The mechanism of silica-acrylic emulsion on water-based inorganic zinc-rich coatings was also discussed. The results indicated that when the modulus of potassium silicate was 3.3, the addition of moderately hydrolyzed silicone-acrylic emulsion was 5% ~ 10%, the film’s hardness, flexibility and adhesion were 5H, 4mm and grade 1, respectively, there is no significant change that the film has been immersed in water and 5% sodium chloride solution over 7 days, the coatings showed the best comprehensive performance.