Method for preparing pineapple peel residue fruit vinegar

The invention relates to a method for preparing pineapple peel residue fruit vinegar, which comprises the following steps: crushing pineapple peel residues to obtain a pineapple serum with granule diameters smaller than 5 millimeters; using 15 to 18 percent of sticky rice syrup to replace white sugar to adjust the mixed residue fermentation liquor sugar degree to 14 degrees Bx; adopting a mixed culture fermentation method of alcohol microzymes, flavor enhancing microzymes, lactobacilli, and the like to carry out alcoholic fermentation and acetic fermentation, and obtaining raw vinegar by aging; and blending the raw vinegar into a fruit vinegar drink by diluting and fermenting. The vinegar drink has smooth and dense mouth feelings, soft and tasty sourness and special faint scent taste of the pineapples and the sticky rice, and has no green odor and harsh taste of the conventional method, so the taste and the quality are obviously improved. In the period of the alcoholic fermentation, fermentation requirements can be achieved within only two days, and the fermentation cycle is obviously shortened. In addition, after the alcoholic fermentation, most celluloses of the pineapple peel residues are utilized, deposited residues are few, and the utilization rate of the peel residues is high. The method has the advantages of simple process, short production cycle and low energy consumption, and opens a novel technical approach to the high-value integrated processing and utilization of the pineapple peel residues.