TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: The method further comprises recovering keto-carotenoids by performing liquid-liquid extraction of keto-carotenoids and lipids contained in supernatant discharged from chemically processing step with non-polar solvent. The step (a) comprises impregnating Haematococcus pluvialis with sodium dodecyl sulfate solution and stirring to break cell wall, centrifuging mixture of Haematococcus pluvialis and sodium dodecyl sulfate solution to obtain supernatant and wet Haematococcus pluvialis with destroyed cell walls, and washing obtained residue with ultrapure water. The method is performed using 6-9 ml 1 wt.% sodium dodecyl sulfate solution per 1 g Haematococcus pluvialis. The ultrasonic extraction step comprises: placing polar organic solvent with wet Haematococcus pluvialis from step (a) into an extraction reactor embedded with an ultrasonic generator, exposing ultrasound for period of time, and extracting keto-carotenoids and lipids in the organic solvent; and centrifuging organic solvent extract mixed with Haematococcus pluvialis, extracted keto-carotenoids and lipids, and separating supernatant (keto-carotenoids, lipid and organic solvent) and wet Haematococcus pluvialis in organic solvent. The step (c) comprises mixing the non-polar organic solvent with the centrifuged supernatant, adding ultrapure water, and separating into upper non-polar organic solvent layer concentrated with lipid and mixture of lower polar organic solvent and ultrapure water concentrated with keto-carotenoids. The step (e) comprises evaporating mixture of ultrapure water and keto-carotenoids to obtain crude keto-carotenoids, dissolving the obtained crude keto-carotenoids in non-polar organic solvent, passing crude keto-carotenoids dissolved solution through the adsorption tower filled with non-polar polymer adsorbent, adsorbing astaxanthin and discharging component discharge liquid with low polarity than astaxanthin, supplying non-polar solvent to non-polar polymer adsorbent adsorbed with astaxanthin, desorbing astaxanthin, evaporating discharge liquid discharged from the adsorption tower. The keto-carotenoids recovering step comprises filtering supernatant separated in centrifugation of the chemically processing step, adding mixed solution of ethyl acetate and methanol to the filtered supernatant, performing liquid-liquid extraction, evaporating upper ethyl acetate layer dissolved with keto-carotenoids and lipid, and recovering keto-carotenoids and lipid. The method comprises mixing acetone and methanol in 0.3-0.9 ratio, adding 35-45 ml obtained mixture to 1 g Haematococcus pluvialis, and ultrasonically extracting; mixing acetone and ethanol in 0.5-0.95 ratio, adding 35-45 ml obtained mixture to 1 g Haematococcus pluvialis, and ultrasonically extracting; mixing acetone and ethyl acetate in 0.2-0.95 ratio, adding 35-45 ml obtained mixture to 1 g Haematococcus pluvialis, and ultrasonically extracting; mixing ethyl acetate and methanol in 0.2-0.8 ratio, adding 35-45 ml obtained mixture to 1 g Haematococcus pluvialis, and ultrasonically extracting; or mixing ethyl acetate and ethanol in 0.35-0.9 ratio, adding 35-45 ml obtained mixture to 1 g Haematococcus pluvialis, and ultrasonically extracting. The method makes use of a mixture of hexane and pure water in volume ratio of 0.31-1.53:0.4-1.54, when using acetone and methanol in ratio of 3:1 as mixed polar organic solvent in liquid-liquid extraction step. Preferred Components: The volume of non-polar organic solvent, which is ethyl acetate and methanol in ratio of 1.7:1 per 1 ml supernatant, added to Haematococcus pluvialis is 50-132 ml per 1 g Haematococcus pluvialis. The polar organic solvent is single polar organic solvent including methanol, ethanol, ethyl acetate or acetone, or mixed polar organic solvent including acetone and methanol, acetone and ethanol, acetone and ethyl acetate, ethyl acetate and methanol, or ethyl acetate and ethanol. The non-polar organic solvent used in liquid-liquid extraction is hexane or petroleum ether. EXAMPLE - No suitable example given.