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This study adopts the sol-gel method to prepare a TiO₂ coating on the surface of the AZ91 magnesium alloy, hydrolyse C₁₆H₃₆O₄Ti to generate the TiO₂ coating and form a film with excellent corrosion resistance on the surface of an AZ91 magnesium alloy. The composition, surface structure and microstructure of the TiO₂ coatings are characterised via X-ray diffraction (XRD) and scanning electron microscopy. The corrosion performance of the surface coatings was investigated through hydrogen evolution experiments and electrochemical tests. The results demonstrate that TiO₂ sols prepared from a mixture of hydrochloric acid, deionised water, C₁₆H₃₆O₄Ti and anhydrous ethanol can form stable layers on the surface of an AZ91 magnesium alloy after heat treatment. The results of hydrogen evolution experiments and electrochemical tests reveal that the TiO₂ coating can effectively improve the corrosion resistance of the AZ91 magnesium alloy.