The invention provides a diamond glaze for ceramic tiles.One), a formula comprises: spodumene powder, frit powder, potassium feldspar powder, calcined talc powder, barium carbonate powder, wollastonite powder, kaolin powder, white alundum powder, and zinc oxide; two), a preparation method comprises the steps: 1, preparing the frit powder, potassium feldspar, wollastonite, raw talc, barium carbonate, calcite, quartz, crude aluminum oxide, 95 zinc oxide, potassium carbonate and strontium carbonate, 1), placing all materials in a melting furnace, and heating to 1500 DEG C to obtain frit; 2), taking out for cooling to normal temperature, crushing, screening with a 100-mesh screen for use, and if disqualification occurs, crushing and screening until qualification; 2, placing all materials of formula one) into a stirrer, and stirring well to obtain the diamond glaze.The method has a simple process, the diamond glaze has high glaze, can prevent cracking, cut facture and the like, has excellent wear resistance and is useful in the production of polished tiles closer to nature and richer in color.