The invention discloses a method for conveniently and quickly purifying dihydromyricetin from
ampelopsis grossedentata leaves. The method comprises the following steps: a, crushing
ampelopsis grossedentata leaves, extracting the crushed
ampelopsis grossedentata leaves by using
alcohol / water with the
volume fraction of 70-90%, and separating in a centrifuging or filtering manner to obtain an
alcohol extracting solution, wherein the used
alcohol is
ethanol,
methanol or isopropanol; b, adding water into the alcohol extracting solution, removing the alcohol
solvent in the alcohol extracting solution through reduced pressure
distillation under the water bath condition of 40-50 DEG C, gradually separating out solids from the remaining water-based
solvent along with the gradual
distillation removal of alcohol from the
solvent, standing for cooling to
room temperature, and then centrifuging or filtering to remove water to obtain a primarily extracted
solid; and c, washing the primarily extracted
solid with water, then carrying out suspension washing with an alcohol-containing
ethyl acetate, alcohol-containing
dichloromethane or alcohol-containing
chloroform mixed solution, filtering to remove the washing solution, and
drying to obtain dihydromyricetin, wherein the used alcohol is
ethanol,
methanol or isopropanol. The method has the advantages of simple operation, high extraction yieldand the like.