Abstract: A pure aluminum sheet metal was put in a weakly alkaline metal salt solution, and a basic zinc carbonate coating grew on the pure aluminum sheet. Then the coating was modified with stearic acid ethanol solution, and the wettability, surface morphology and chemical composition of the coating before and after modification were studied. The results show that the basic zinc carbonate coating on aluminum surface had micro-nano binary structure, the contact angle of the coating before and after modification was 0° and 163.1°, respectively, which realized the transition from superhydrophilic surface to the superhydrophobic surface, this was because the long chain alkyl with low surface energy adsorbed or grafted on the coating surface changed the wettability of the coating.