Method for producing grape vinegar by mixed fermentation of grape and grain

The invention relates to a technology of producing vinegar, in particular to a method for producing grape vinegar through mixed fermentation of grapes and grains, and aims at solving the problems existing in the prior art which utilizes grapes as raw materials to produce fruit vinegar, such as simple production technique and ordinary flavor, etc. The method comprises the following steps: (1) grape pulp preparation: mashing grapes to obtain the grape pulp; (2) alcoholic fermentation; (3) acetic fermentation; (4) smoking, fermenting and pouring vinegar; and (5) ageing. Compared with the prior art, the invention is characterized in that the grape pulp and the grains are subjected to the mixed fermentation and proper fermentation parameters are selected; relative to fruit vinegar of a single variety in the prior art, the vinegar obtained through the invention combines the comprehensive advantages of mature vinegar and the fruit vinegar; and the invention comprehensively utilizes all the essences of the grapes instead of only using grape skin, and the produced vinegar has comprehensive nutritional ingredients and flavoring substance.