The invention provides a preparation method of a novel ceramic glaze which is prepared by adding water and diamond nano graphene into a basic glaze. The preparation method comprises the following steps: (1) proportionally weighing the basic glaze, and performing ball-milling and dry-milling; (2) sieving after ball-milling, adding water into the undersized substance, and mixing to obtain a mixed liquid; and (3) adding diamond nano graphene into the mixed liquid, and continually mixing. Meanwhile, the invention discloses a ceramic glaze prepared by the method and a glaze application process of the ceramic glaze. In the application process of the novel ceramic glaze, when the content of diamond nano graphene is within a certain range, the ceramic photoinduction degree can be effectively improved, and the attractiveness of a ceramic tile can be improved accordingly; as diamond nano graphene is high in hardness and strong in abrasiveness, after adding of diamond nano graphene, the hardness and the abrasiveness of the ceramic tile can be effectively improved, and accordingly, the service life of the ceramic tile is prolonged; and as after adding of diamond nano graphene, the attractiveness, the hardness and the abrasiveness of the ceramic tile can be improved, the selling price of the ceramic tile is increased, and accordingly, the profit of manufacturing enterprises is improved.