The present invention relates to the technical field of compound extraction, discloses a kind of extraction process of
fisetin in cotinus coggygria, including: S1: take the
branch and / or leaves of cotinus coggygria and crush them to obtain cotinus coggygria crushed material;S2: cotinus coggygria crushed material is added into a continuous countercurrent extraction tank, water is added, extraction is started, and extraction temperature is 90-95 DEG C to obtain extract;The extract is filtered and filtrate is taken, heated and concentrated to obtain a crude extract;S3: the crude extract is rinsed, filter and take
filter cake, obtain
solid,
solid is added to
ethanol for
dissolution, after adding water and filtering, reduced pressure is concentrated to
ethanol concentration of 60%-75%,
crystallization, filter and take
filter cake, obtain refined extract;S4:
ethanol is added to the refined extract, heated to dissolve and continue 1-1.5h, filter and take filtrate, after reduced pressure is concentrated to ethanol concentration of 70%-75%, stand
crystallization filtration and
drying, obtain
fisetin finished product. The extraction process of the present invention has high extraction efficiency, large conversion rate and is green and
environmentally friendly.