The invention provides a blending process of reducing dye. The blending process includes following operation steps: 1), mixing to-be-processed dye, adding a small amount of water and a blender, sufficiently stirring, and heating; 2), when the dye restores to room temperature, adding a small amount of water and alkali liquid, stirring, and heating to 43-50 DEG C; 3), cooling the dye treated in the step 2), adding sodium hydroxide and sodium hydrosulfite solution, and diluting to needed concentration. The dye is stirred and mixed, and the alkali liquid is added, heated, stirred and blended, so that mixing and reducing rate of the dye is greatly increased; diluting is performed finally, so that reduced dye can be timely blended well after reaction; the whole blending process is suitable for industrial production and processing and can be further popularized and applied.