The invention provides an extraction method for galanthamine from lycoris radiate. The method includes following steps: (1) determination of chromatographic conditions: employing a Kromasil100-5C18 reversed-phase column (250mm*4.6mm, 5[mu]m) as an chromatographic column and an acetonitrile-phosphoric acid buffer solution (17:83) mixture as an mobile phase, and setting a column temperature to be 35 DEG C, a sample volume to be 20[mu]L and a detection wavelength to be 290nm, wherein the phosphoric acid buffer solution, which is 7.02 in pH value, is prepared by following steps: dissolving 2.72g of potassium dihydrogen phosphate in 100ml of water, adding 1.4ml of triethylamine and performing a diluting process to 1L; (2) establishment of a standard curve: establishing a regression equation according to the chromatographic conditions in the step (1); and (3) extraction of the galanthamine: weighing 2.0g of lycoris radiate. Herb powder, adding cellulase and pectinase, adding an aqueous solution with a pH value being 4.5 at a certain temperature for carrying out an extraction process for a certain time, performing a 5000r / min centrifuge process for 20 min, taking a supernatant, performing chromatographic measurement and calculating a yield of the galanthamine. The invention is low in extraction cost, is short in extraction time, is simple in technology, is free from polluting environment and is high in extraction yield.