Method for extracting hydroxytyrosol

The invention discloses a method for extracting hydroxytyrosol, which comprises the following steps of: preparing raw material extracting solution; taking one kind of extracting solution, adding concentrated hydrochloric acid to make the pH value thereof 0 to 2, boiling for 2 to 4 hours and hydrolyzing; allowing the hydrolyzate to pass through macroporous adsorption resin for column chromatography, eluting by using acid liquor with the pH value of 1 to 2, mixing the effluent liquid and pickling liquor, regulating the pH value to neutral, concentrating and filtering; making the filter liquor to pass through the macroporous adsorption resin for column chromatography, eluting by using 10 to 30 volume percent ethanol, collecting the eluent, concentrating, and drying to prepare the hydroxytyrosol. By acidifying the raw material extracting solution, the method realizes conversion of the hydroxytyrosol through the boiling process, greatly shortens the conversion time of the hydroxytyrosol, improves the conversion rate, integrally shortens the production cycle and saves the production cost. The hydroxytyrosol is prepared through separation and purification by the macroporous adsorption resin.