The invention discloses a preparation method of a doped and coated lithium cobaltate anode material. According to the method, anhydrous magnesium acetate powder and aluminium isopropoxide powder are sequentially added into a lithium cobaltate material containing doped elements, then an excessive amount of absolute ethyl alcohol solution is added, then a tetraethoxysilane solution is added, the mixture is stirred to be uniform, dried, calcined, crushed and sieved, and the lithium cobaltate anode material coated with Al, Mg and Si is obtained. In this way, anhydrous magnesium acetate, aluminiumisopropoxide and tetraethoxysilane are dissolved in the absolute ethyl alcohol solution and mixed with the lithium cobaltate material in a liquid phase, therefore, the effect that the surface of lithium cobaltate is uniformly coated with oxides of Al, Mg and Si is achieved, and then the electrochemical performance of the lithium cobaltate material is improved.