The invention relates to an ink-jet penetrated polished semitransparent ceramic sheet. The ink-jet penetrated polished semitransparent ceramic sheet comprises a semitransparent green body containing an ink dyeing assistant agent, and an ink jet penetrating layer penetrating into the semitransparent green body. According to a preparation method, the ink dyeing assistant agent is added into the semitransparent green body, and ink jet penetrating technology is adopted, so that penetration of patterns into the semitransparent green body is realized, polishing is carried out directly after sintering, green body surface particle flatness is excellent, stain resistance is excellent, pattern wear resistance is excellent, and requirements on highlight products are satisfied, adding of a transparent glaze layer onto the surface of the green body is not necessary, cost is reduced, a problem that bonding of the glaze layer with the green body is poor is solved, production deformation cracking is avoided, the preparation method of the green body is simple, adding of non-transparent preform body is unnecessary, and in addition, the semitransparent green body contains the ink dyeing assistant agent, so that the color of the patterns used for decoration is bright, sharpness is high, and decoration requirements can be satisfied preferably.