NOVELTY - Extraction of salicin from white willow bark includes cutting or crushing white willow bark, and UV-irradiating; adding water and salt, soaking, and filtering; adding water and cellulase and alkaline protease enzyme, enzymatically hydrolyzing, and sonicating; concentrating, taking sample, adding into polyamide column, eluting with aqueous ethanol solution, partially collecting ethanol fraction, recovering ethanol, and concentrating; and adding into neutral alumina column, eluting with water and with ethanol respectively, eluting with glacial acetic acid aqueous solution, and collecting eluate.    USE - Method for extraction of salicin from white willow bark (claimed).    ADVANTAGE - The method does not need to use quicklime, can recycle solvent, and has low cost, high yield, and reduced pollution to environment.    DETAILED DESCRIPTION - Extraction of salicin from white willow bark comprises:    (A) cutting white willow bark into 1-2 cm sections or crushing, and UV-irradiating for 30-50 minutes;    (B) adding 5-10 times water and 3-8 wt.% salt, soaking at room temperature for 1-2 hours, and filtering;    (C) adding 1.5-2 times water and 0.5-2 wt.% cellulase and alkaline protease enzyme at ratio of 1:2, enzymatically hydrolyzing to 20-40 degrees C for 1-3 hours, and sonicating hydrolyzate every 15 minutes at frequency of 40-50 kHz and power of 200-300 W;    (D) concentrating, taking sample, adding into polyamide column at volume ratio of 1:5-1:25 and resin column diameter ratio of 1:4-1:15, eluting with aqueous ethanol solution, partially collecting 40-70% ethanol fraction, recovering ethanol, and concentrating under reduced pressure until no more alcohol taste; and    (E) adding into neutral alumina column at resin column diameter ratio of 1:4-1:15, eluting with 1-3 times water and with 1-2 column volumes of 95% ethanol respectively to remove impurities, eluting with 6-10 times 0.3-0.8% glacial acetic acid aqueous solution, collecting eluate, recovering glacial acetic acid, and microwave vacuum drying.