The invention discloses a preparation method for an AC electroluminescence device, and the method comprises the following steps: firstly preparing a flexible ionic conductor through hydrosol doped with dissociable metal salt; secondly selecting polydopamine to wrap high-dielectric ceramic particles, carrying out the grafting of oxidized graphene on the surface of the polydopamine, carrying out the reduction of the oxidized graphene through a chemical reduction method, and obtaining a dielectric elastomer with the surface of the polydopamine being provided with the oxidized graphene in a grafting manner; finally combining the flexible ionic conductor, the dielectric elastomer, the AC electroluminescence device, the dielectric elastomer and the flexible ionic conductor sequentially, and obtaining the AC electroluminescence device in a sandwich structure, wherein one flexible ionic conductor layer is in series connection with a positive electrode line of an AC signal, and the other flexible ionic conductor layer is in series connection with a negative electrode line of the AC signal. The AC electroluminescence device prepared through method is good in stability, is good in tensile property, saves the energy, and is environment-friendly.