The invention belongs to the technical field of preparation of new material dental implant abutments, and relates to a preparation method of a zirconium oxide dental implant abutment. The preparation method with the technology comprises three steps of slurry preparation, blank forming, and microwave sintering. The preparation method has the advantages that the nanometer chemical zirconium oxide is processed and manufactured into an all-ceramic prosthesis and the dental implant abutment with maximum precision and minimum tolerance by CAD/CAM (computer-aided design/computer-aided manufacturing), cold-state isostatic pressing forming method and microwave sintering technology via phase-change toughening, the dental biology requirements are met, the strength of the material is approximate to the mechanical strength of natural teeth, and only surface polishing is required after the sintering is completed; the strength is high, the abrasion-resistant property is good, the polishing property is better, the friction coefficient is small, the size stability is good, and the self-lubricating property is good; the biocompatibility, anti-breaking strength, breaking toughness, light transparency, edge suitability and aesthetic effect of the abutment and the prosthesis are improved, the clinical restoration therapy time is shortened, the medical cost is reduced, the leading level of international similar techniques is reached, and the material is suitable for being popularized and applied to home and abroad, and is favorable for bringing benefits to mankind.