Preparation method of urd bean four-grain liquor

The invention discloses a preparation method of urd bean four-grain liquor. The method comprises the following steps: (1) thoroughly grinding a urd bean raw material; (2) putting the urd bean powder into a clarification device, adding sorghum-seed raw pulp liquor, stirring for 20 minutes, and then, standing for 20 days; (3) extracting black supernatant from the clarification device; (4) filtrating the supernatant; (5) taking out the urd bean raw material, uniformly mixing the urd bean raw material with wheat, polished glutinous rice, sorghum seeds and bran, steaming, adding a distiller's yeast, and fermenting in a pool; (6) opening a cellar, taking out grain stillage, and distilling liquor, so as to obtain distilled liquor; (7) adding the black supernatant, filtrated and collected in the step (4), into the distilled liquor, mixing uniformly, and blending, thereby obtaining the urd bean liquor. According to the preparation method of the urd bean four-grain liquor, the full utilization of alcohol-soluble protein in urd bean kernels and melanin and functional substances in urd bean seed coats is realized, so that the urd bean four-grain liquor has particular anticancer and anti-aging effects, which are not possessed by ordinary mung-bean liquor, and further has the stomach nourishing effects of improving the formation of human body gastric mucosa and preventing and treating gastrointestinal diseases, such as intractable gastritis and gastric ulcer.