The invention discloses an environment-friendly agate glaze and a preparation process thereof. The ceramic material is prepared from the following raw materials in parts by weight: 25-35 parts of agate, 8-15 parts of plant ash, 1-2 parts of magnesium oxide, 1-3 parts of ferric oxide, 0.6-1.2 parts of nano titanium dioxide, 3-5 parts of feldspar, 5-8 parts of diatomite, 1-3 parts of an antibacterial agent, 4-6 parts of quartz, 5-8 parts of talc, 2-4 parts of wollastonite and 18-25 parts of distilled water. The agate and the plant ash are used as base materials and matched with the feldspar, thediatomite, the quartz and the wollastonite, so that the fired agate glaze has good plasticity, fire resistance and other physicochemical properties, the fired agate glaze is excellent in smoothness and jade sense layering sense, and the talc is used for improving the thermal stability, expanding the firing range and enhancing the opacification effect; and theglaze curling is reduced, the internalquality, the appearance quality and the mechanical strength resistance of the agate glaze are greatly improved, and the agate glaze has great environmental protection performance.