The invention provides a production method of acid flavoring liquor. The method comprises the following steps: A) mixing waste Baijiu grains, a saccharifying fermenting agent and ending liquor, and conducting sealed
fermentation, so that fermented waste grains are obtained; and B) cross-
steaming the fermented waste grains and original liquor, so that acid flavoring liquor is obtained. Since the Baijiu grains are used as a
raw material, the raw materials is converted into such organic acids as
acetic acid and the like by virtue of the saccharifying fermenting agent, a precursor material is provided for the waste grains by adding the ending liquor which contains a certain amount of
alcohol and the original liquid is subjected to cross-
steaming, compared with the prior art, the production method disclosed by the invention can effectively extract organic acids from the fermented waste grains, so that the acid flavoring liquor, as a finished product, is relatively high in content of total acids most of which are low-boiling-point
volatile fatty acids such as the
acetic acid and the like; the flavoring liquor, which is clean in quality, low in content of impurities, low in blending dosage and obvious in blending effect, is capable meeting the requirement of a finished Baijiu product on the content of the total acids; liquor, which is blended with the flavoring liquor, is stronger, more delicious, mellow and softer-sweeter in quality; and the liquor is relatively long in
aftertaste and is free from the generation of miscellaneous taste.