Extraction method of kavalactone for cosmetics

The invention discloses an extraction method of kavalactone for cosmetics, and belongs to the technical field of extraction of effective components of natural plants. The extraction method comprises the following steps: crushing and sieving dried kava pepper roots to obtain kava pepper root powder; mixing the kava pepper root powder with water in a heating device, heating to 70-90 DEG C, feeding into a filtering device after heating, filtering under the pressure of 0.4-0.6 MPa, feeding filtrate into the filtering device again through the heating device, and circularly filtering in this way; cooling, crystallizing and filtering the filtrate subjected to circulating filtration to obtain a paste substance, heating the paste substance to 45-55 DEG C, centrifuging, taking supernate, and cooling to obtain the kavalactone for the cosmetics. The extraction and purification process provided by the invention does not need to use an organic solvent, breaks through innovation in the extraction solvent, completely eradica