The invention provides an artificial Buddhist relics product and a preparation method thereof. The artificial Buddhist relics product comprises a hard core and a bone ash outer layer. The bone ash outer layer is formed by sintering and bonding bone ash slurry to the surface of a hard core. The hard core is a metal core with the surface subjected to micro-arc oxidation to obtain a ceramic membrane layer containing hydroxyapatite; the bone ash slurry comprises bone ash crystal powder, auxiliary materials and an inorganic binder; and the bone ash crystal powder is obtained by high-temperature roasting and smashing of bone ash. In the artificial Buddhist relics product, the metal core is embedded, so that the strength of the Buddhist relics product is improved. On the surface of the metal core, the TiO2 porous ceramic membrane layer obtained by micro-arc oxidation and containing hydroxyapatite has the same ingredients as the bone ash; in the sintering and bonding process of the bone ash slurry and the metal core, the bone ash slurry can permeate into the porous ceramic membrane layer and is firmly combined with the membrane layer, and the bonding strength of the hard core and the bone ash outer layer is improved.