The invention provides a preparation process of corrosion-resistant paint. The preparation process of corrosion-resistant paint comprises the following steps: step one, pouring a certain amount of sodium silicate solution into a container and slowly heating; step two, slowly adding silicone acrylic emulsion into the container, continuously stirring, and stopping heating after finishing adding the silicone acrylic emulsion; step three, adding a proper quantity of titanate coupling agents into the container and stirring at high speed; step four, adding zinc powder and continuously stirring uniformly; and step five, finally adding a proper amount of MgCl2 aqueous solution and sodium stearate successively to obtain the corrosion-resistant paint. The processing process of the corrosion-resistant paint is simple and convenient; the produced product is high in quality and high in abrasion resistance; the production cost is reduced; meanwhile, the corrosion-resistant paint is low in raw material cost and high in performance, is clean and environmental-friendly, and meets the demands of a large number of users.