The invention belongs to the field of preparation of daqu liquor, and in particular relates to a method for preparing blending liquid by utilizing yellow water, and an application of the blending liquid. The method comprises the following steps: adding a suitable amount of attapulgite into fresh yellow water, stirring under
room temperature for 4-8 h, standing, clarifying, centrifuging, intercepting filter residues, and taking the
clear liquid, thus obtaining first-grade
clear liquid; carrying out
microfiltration on the first-grade
clear liquid by adopting a 0.2 Mu m inorganic
ceramic membrane for removing the residual attapulgite particles, intercepting filter residues, and taking the clear liquid, thus obtaining second-grade clear liquid; and carrying out
nanofiltration on the second-grade clear liquid by adopting an organic membrane with the molecular
cut off being 300, intercepting filter residues, and taking the clear liquid, and thus obtaining the colorless and transparent blending liquid. The method is simple, convenient and effectively; the attapulgite is mainly used for absorbing macromolecular impurities, the
colloid property of yellow water is destroyed, the
viscosity is reduced, the blockage for the membrane during the follow-up membrane
filtration processes is alleviated, the clarified yellow water is rapidly decolored and concentrated by utilizing the
microfiltration using the inorganic
ceramic membrane and the
nanofiltration using the organic membrane, and finally the colorless and transparent blending liquid with special
flavor is obtained.