The invention relates to the technology of surface coatings and aims at providing a preparation method of an alcohol-group aluminum alloy hub coating. The method comprises the steps of firstly, preparing composite pigment, and then mixing and grinding the composite pigment, inorganic filler and alcohol solvent, so that composite color paste is obtained; finally, adding silicon-titanium composite sol which is prepared in advance and the composite color paste into a reaction kettle, and conducting stirring and mixing, so that the aluminum alloy hub alcohol-group protective coating is obtained. According to the preparation method of the alcohol-group aluminum alloy hub coating, a titanate hydrolytic polymerization reaction is controlled, thus a final coating material can be reinforced and toughened, shrinkage stress and the expansion coefficient of the coating are lowered, and anti-permeability and corrosion resistance of the coating are improved comprehensively; the key problems of coloring uniformity, long residual action and compatibility with a system and the like related to pigment are solved; solvent which is high in toxicity, such as esters and xylene, is not contained, corrosion resistance and the decorative function are integrally achieved, the coating process is simplified, a chromizing process required for traditional hub coating is omitted, and the environment-protection problems of chromium ion pollution, VOC emission and the like are solved.