The invention provides Jun porcelain bluish white glaze. The Jun porcelain bluish white glaze is prepared from the following raw materials in parts by weight: 42-47 parts of white feldspar, 12-18 parts of quartz, 15-21 parts of calcite, 2-4 parts of copper ores, 1.5-2.5 parts of tin blocks, 2.5-3.5 parts of bone ash, 12-18 parts of wood ash and 0.25-0.75 part of iron ores. Compared with the prior art, the Jun porcelain bluish white glaze has the advantages that the reasonable raw material proportion is utilized, a sintering process is controlled, and the color is developed by virtue of multiple color-developing substances in the ores, so that the developed color of the prepared Jun porcelain bluish white glaze is relatively natural, a intermediate color is developed during the color change, and copper mouth and iron foot effects are achieved, the Jun porcelain bluish white glaze has strong texture and opacifying property, and the rate of finished products is high and can reach 93% or above.