The invention relates to a preparation method of a ceramic article with an inner ring, which is realized in a way that: two opposite mandrels are used for isostatic compaction, an elastomer is added between the two opposite mandrels, a stretching amount is left between two axial locating surfaces after the mandrels are assembled, and the two locating surfaces are attached to each other during isostatic compaction; and after the isostatic compaction, the elastomer separates the two mandrels in the pressure relief process, so that the inner ring and cylindrical section of the blank expand at the same time, thereby avoiding the generation of internal stress and further avoiding the generation of microcracks in the blank. Due to the adoption of the micro-stretching mandrels, the cracks in theceramic blank with an inner ring structure can be completely prevented in the forming process, and the ceramic article is convenient to assemble and has a reliable structure. The internal ring of theceramic article can be formed in one step, and does not need turning, thereby saving the consumption of raw materials and the processing cost.