The invention relates to the technical field of cosmetics and discloses a betula alba bark extract as well as an extraction method and application thereof. The extraction method comprises the following steps: extracting betula alba bark by adding an alcohol solvent and removing the alcohol solvent in the obtained crude extracting solution to obtain an alcohol extract; loading partial alcohol extract on macroporous resin and carrying out gradient elution by successively using deionized water, 30 percent ethanol solution, 70 percent the ethanol solution and 95 percent the ethanol solution; respectively collecting eluent A-D and respectively concentrating to obtain an elution extract A-D; redissolving one or more than two of the remaining betula alba bark extract and the elution extract A-D by using the alcoholic solution to obtain the betula alba bark extract. According to the extraction method disclosed by the invention, the betula alba bark is used as an extracted object; the betula alba bark extract which can significantly inhibit the proliferation and lipid synthesis of sebaceous gland cells is obtained through the extraction of an alcohol reagent and a gradient elution procedure, so that the aim of oil control is effectively realized and the application range of betula alba in cosmetics is expanded.