The invention discloses a method for extracting an active ingredient of fresh gingers. The method comprises the following steps: taking fresh gingers and cleaning with water and then putting the cleaned fresh gingers into a pulping machine for pulping; filtering the acquired slurry and separating the filtrate and the solid grains; performing vacuum drying on the solid grains, thereby acquiring the fresh ginger powder; settling the separated filtrate, layering and then acquiring an upper layer served as oil layer and a lower layer served as bottom material; performing vacuum drying on the oil layer, thereby acquiring ginger oil; adding an organic solvent into the bottom material and extracting, layering and then acquiring an upper layer served as oil layer and a lower layer served as aqueous layer material; distilling the oil layer on the upper layer, separating the ginger oil and recycling the organic solvent; concentrating and drying the aqueous layer material, thereby acquiring the ginger extract containing ginger saponin. According to the method disclosed by the invention, the fresh gingers are pulped and then the pulped fresh gingers are prepared into the ginger powder and the ginger oil, and meanwhile, the active ingredient of ginger saponin is recycled, the active ingredient of ginger is fully extracted and the use ratio of the fresh ginger is increased.