Fermented apple vinegar obtained by three-time mixed fermentation of whole apples and preparation process of fermented apple vinegar

The invention discloses a preparation process of fermented apple vinegar by three times of mixed fermentation of whole apples. The preparation process comprises the following steps: S1, selecting raw materials: selecting apples, cleaning, and selecting cavings to remove impurities; s2, raw material treatment: disinfecting the raw fruits obtained in S1, crushing and feeding into a No.1 pool; s3, primary alcoholization fermentation: uniformly mixing the activated distiller's yeast and saccharifying enzyme liquid, adding cavings into a No.1 pool, and uniformly mixing and fermenting; s4, secondary vinegar fermentation: adding acetic bacteria into the fruit wine mash alcohol obtained in S3 for secondary fermentation; s5, third-time neutralization slow fermentation: disinfecting the apples in the S1, crushing the apples, adding the crushed apples into a second pool, and pumping the mixed liquid in the S4 into the second pool for fermentation; and S6, filtering the fermentation mixed solution in the step S5, sterili