The invention discloses a preparation method of Chishui vinegar. The preparation method includes washing rice and glutinous rice, boiling up the rice, adding the glutinous rice, boiling the two untilno rice core exists to obtain rice porridge, cooling the rice porridge in a special clay
fermentation tank, adding vinegar koji for
alcohol fermentation, and after
fermentation, adding
bran for blending; carrying out fermentation according to strict regulations after blending, manually putting a fermented mature vinegar culture into a special clay
drying tank for sealed cultivation, and putting the special clay
drying tank in a
drying ground for
esterification reaction; exchanging the vertical position of the vinegar culture in the tank through manual turning, fully filling the tank with the vinegar culture and
stamping the vinegar culture to avoid gaps, and covering the mouth of the tank in an all-around way by salt to isolate the vinegar culture from air and mosquitoes to further achievefreshness keeping, sterilization and
mildew resistance; soaking the mature vinegar culture and high-quality spring water proportionally, pouring vinegar according to a three-cycle method, drying vinegar liquid, and performing concentrated
ageing. By the preparation method, the Chishui vinegar with a reasonable fermentation degree, small
acetic acid concentration differences and stable product quality is obtained.