Caramel plant ash glaze and preparation method thereof

The invention discloses caramel plant ash glaze and a preparation method thereof, and the caramel plant ash glaze comprises the following raw materials in parts by weight: 55-65 parts of plant ash, 30-40 parts of clay and 3-8 parts of spinel-garnet type reddish brown composite pigment. The spinel-garnet type reddish brown composite pigment is prepared by co-firing 90 to 100 parts of FeCrZn spinel pigment, 13 to 15 parts of Y2O3 and 12 to 14 parts of Al2O3. The invention further discloses a preparation method of the spinel-garnet type reddish brown composite pigment. The FeCrZn spinel pigment is prepared from the following raw materials in parts by weight: 25 to 35 parts of Fe2O3, 15 to 20 parts of Cr2O3 and 35 to 55 parts of ZnO. The spinel-garnet type reddish brown composite pigment is added on the basis of the plant ash and the clay, the color of the plant ash glaze can be adjusted to be dark reddish brown, and the requirements of the market for diversified glaze colors are met; the thermal expansion perfor