The invention provides jun porcelain purple glaze. The glaze is prepared from the following raw materials in parts by weight: 43-49 parts of melilite, 9-15 parts of quartz, 12-18 parts of calcite, 3-5parts of kaolin, 5-7 parts of zinc oxide, 0.5-1.5 parts of limestone, 0.25-0.75 part of cobaltous oxide, 1-2 parts of copper ores and 2-4 parts of iron ores. Compared with the prior art, the jun porcelain purple glaze has the advantages that by scientific and reasonable raw material ratio and control on a firing process, the fired jun porcelain purple glaze does not have floating light, and is high in jade texture and opacifying property, and the yield is high and can reach 95% or above.