The invention provides an anticorrosive hydrophilic coating containing chlorinated natural rubber, and a preparation method thereof. The anticorrosive hydrophilic coating mainly contains, by weight, 8-16 parts of chlorinated natural rubber, 0.5-6 parts of an ethylene-vinyl acetate copolymer (EVA), 0.36-4.32 parts of polyvinyl alcohol resin (PVA), 80-150 parts of water, 20-30 parts of styrene, 2-6parts of zinc phosphate, 1-2.5 parts of barium sulfate, 5-10 parts of silica sol and 1.2-9.6 parts of montmorillonite. The coating can spontaneously form a hydrophobic anticorrosive bottom layer and ahydrophilic surface coating layer after being applied one time, the performances of all coating layers have natural transition, the adhesion between the coating layers is high, and the coating has the advantages of reduction of the coating cost, saving of the labor time and the labor, easily available raw materials, simple preparation method, low cost, and easiness in industrial production.