The invention provides an antibacterial tooth implant and a preparation method of the antibacterial tooth implant. The antibacterial tooth implant comprises a tooth implant body, a micro-arc oxidationfilm layer and a nano-antibacterial function material, wherein the micro-arc oxidation film layer is arranged on the surface of the tooth implant body; the nano-antibacterial function material is loaded to the micro-arc oxidation film layer. According to the technical scheme, the micro-arc oxidation film layer is arranged on the tooth implant body, so that the surface pore structure of the toothimplant body is rich, many pore structures similar to volcanic vents exist, therefore, the surface roughness of the tooth implant body can be increased, the surface porosity is alos greatly improved,at the time, the antibacterial function material of the nano size adopting the plasma immersed ion injection method can be injected to the surface of the micro-arc oxidation film layer and also can beinjected into the pore structures of the micro-arc oxidation film layer, so that the loading amount of the nano-antibacterial function material is greatly increased, meanwhile, when bacteria enter the micropores, sterilizing can be carried out in time, so that the permanent antibacterial effect is achieved.