The invention provides a ceramic tile and a preparation method thereof. The ceramic tile comprises a green body, a ground glaze layer and a cover glaze layer, the ground glaze layer is arranged between the green body and the cover glaze layer, and the glaze of the cover glaze layer comprises, by mass, 10-15 parts of Guidan mud, 15-20 parts of titanium oxide, 3-8 parts of antimony-doped tin dioxide, 4-6 parts of lithium carbonate, 13-17 parts of aluminum oxide, 7-9 parts of potassium feldspar, 26-30 parts of zircon sands, 3-8 parts of quartz, 14-18 parts of zirconium oxide, 16-20 parts of clay,14-18 parts of high-alumina sands, 20-30 parts of a whitener, 25-35 parts of a chromogenic aid and 6-8 parts of talcum. The components in the glaze of the surface glaze layer are reasonably proportioned, and sufficient amounts of the whitener and the chromogenic aid are added, so the pattern color of the ceramic tile is gorgeous, the gray scale details are vivid, the chromaticity is improved, thetransparency of the glaze is adjusted, and a crystal layer is thickened, thereby the ceramic tile has good transparency and layering feeling.