The invention relates to the field of microbial
fermentation, in particular to a preparation method of a compound Daqu, so as to solve the problems of the traditional Daqu such as single nutritional components of raw materials, longer
starter-making and
brewing time, low
utilization rate of grains, high cost and the like. The preparation method comprises the following steps: (1) treating the raw materials of the Daqu; (2) inoculating
aspergillus niger 41254,
aspergillus niger UV-11,
monascus,
mucor racemosus,
actinomucor elegans,
rhizopus oryzae,
saccharomyces cerevisiae, candida drusei,
acetobacter,
bacillus subtilis and
lactobacillus delbrueckii 6100 into a conical flask containing the raw materials of the Daqu for culturing, then expanding the culture and obtaining a
mother culture; and(3) adopting uncooked materials for making a
starter, inoculating the obtained
mother culture and the raw materials of the Daqu into a
solid fermentation device, keeping the temperature at 30 DEG C-33 DEG C, continuing for 30-33h, discharging the
starter and finally carrying out low-temperature
vacuum drying. The preparation method enriches the nutritional components in the raw materials and improves the quality of a brewed product; and a plurality of
bacterial strain are artificially added, thereby improving the
utilization rate of the grains, shortening the starter-making cycle, improving the yield of the brewed product and reducing the production cost.