The invention discloses a preparation method of Hexi savory vinegar, in particular to aromatic vinegar obtained by carrying out fermentation on rice and mung beans. The invention provides an original ecology aromatic vinegar preparation method, rice is taken as a main raw material, and in combination with the mung beans, ingredients in the mung beans and the rice are effectively combined by treating in boiling water, placing under vacuum condition and intermittently vacuumizing and breaking vacuum, volatile ingredients in the mung beans are adsorbed to the utmost extent, and then alcoholic fermentation and acetic fermentation are carried out, so that the Hexi savory vinegar is obtained. The prepared vinegar not only has the characteristics of original aromatic vinegar, but also has properties of a mung bean condiment and can enhance capability of the vinegar for removing the fishy flavor. The preparation method disclosed by the invention is simple and controllable in technology, applicable to large-scale production and broad in application prospect.