The invention relates to a wide-spectrum, high-transparency, high-down-degree and low-resistance transparent conductive film and a preparation method of the conductive film. The method comprises the steps of depositing an A1 covering layer on the surface of a ZnO film, performing annealing treatment on the film at high temperature, and obtaining a transparent conductive zinc oxide film material with high conductance, high transparency, wide spectrum and a light trapping property after wet etching technology treatment. According to the method, zinc oxide is a material of a doped semiconductor such as ZnO:A1, ZnO:Ga, ZnO:B, ZnO:Mo, and ZnO:W, and an n-type semiconductor, can be applied to unijunction and multijunction solar batteries of a noncrystalline silicon based film, microcrystalline silicon based film and a nano-silicon based film.