Method for simultaneously extracting various characteristic flavor substances in white spirit byproducts in targeted manner and application of method

The invention belongs to the field of white spirit brewing, and relates to a method for simultaneously extracting various characteristic flavor substances in white spirit byproducts in a targeted manner, which comprises the following steps: adding fresh white spirit byproducts and distilled water into a distilled water side reaction kettle of SDE, adding sodium chloride, heating until slight boiling, adding an organic reagent into an SDE round-bottom flask, heating until boiling, distilling and extracting, filtering, washing, and drying to obtain the white spirit. The solution in the SDE U-shaped liquid storage pipe is discharged, water and extract liquor are separated, the organic solvent is removed, and essential oil is obtained; and target extraction: adding dichloromethane into the essential oil until the essential oil is completely dissolved and clarified, adding a reverse extraction solution for reverse extraction to generate a large number of emulsion layers, centrifuging the emulsion layers to obtain