The invention discloses a wear-resisting coating of a YAG / 8YSZ dual ceramic layer structure and a plasma preparation method. According to the structure of the coating, a binding layer is prepared from NiCoCrAlY, a ceramic bottom layer is prepared from 8YSZ, and a ceramic top layer is prepared from YAG. The preparation method comprises the steps that 1, a base body is processed; 2, spray materials are pretreated; 3, the surface of the base body is cleaned; 4, the surface of the base body is subjected to abrasive blasting; 5, the surface of the base body is preheated; 6, the binding layer is prepared; 7, the binding layer is cooled; 8, the ceramic bottom layer is prepared, and particularly, dried ZrO2.8Y2O3 powder is used for preparing the ceramic bottom layer on the cooled binding layer through the plasma spraying technology; 9, the ceramic bottom layer is cooled, and particularly, the surface of the coating is subjected to air cooling to be cooled to 50-80 DEG C; 10, the ceramic top layer is prepared, particularly, the dried Y2Al5O12 powder is used for preparing the ceramic top layer on the cooled ceramic bottom layer through the plasma spraying technology; and 11, the coating is prepared after being naturally cooled to the indoor temperature.