Purification method of alpha-arbutin

The invention discloses a purification method of alpha-arbutin. The alpha-arbutin which has zero hydroquinone residues is obtained at high yield and is prepared by adopting purified water to dissolve,using ethanol to change system polarity, extracting residual hydroquinone with ethyl acetate or methyl acetate, forcing crystal with ethanol, cooling, crystallizing and other methods. The purification method of the alpha-arbutin has the advantages of simple operation and equipment and lower cost. 本发明公开了种α-熊果苷的纯化方法，采用纯化水溶解，乙醇改变体系极性，乙酸乙酯或乙酸甲酯萃取残留对苯二酚，乙醇逼晶，降温结晶等方法，高收率的得到对苯二酚残留为零的α-熊果苷，操作与设备简单，成本较低。