The present invention discloses a method for extracting levo-synephrine from green tangerine orange peel. The method comprises the following steps: refluxing and extracting the levo-synephrine in green tangerine orange peel powder twice by 15 to 45 percent alcohol at a temperature of 80 DEG C, decompressing and concentrating the extract to 80 to 85 percent of solid which is placed on a D101 macroporous absorption resin column, and eluting the solid by 15 percent alcohol; decompressing and concentrating the eluant to obtain a crude product of the levo-synephrine after spraying and drying; dissolving the crude product of the levo-synephrine by pure alcohol, adding silica gel with the same mass as the crude product, stirring the mixture evenly, removing the alcohol, preparing a silica-gel adsorption sample, sampling by a dry method, using the eluant prepared by methylene chloride and methanol as well as ammonia water the volume ratio of which are 6-9:2:0.1 to elute and collect the levo-synephrine component; and decompressing and concentrating the levo-synephrine component separated and eluted by the silica gel column, and obtaining the levo-synephrine product after spraying and drying. The content of the synephrine in the product prepared by the method is higher than 90 percent.