The invention discloses a method for crystallizing xylobiose, namely 1 to 80g of inorganic salt and 0.67 to 19L of organic solvent are added into each liter of xylobiose solution with a pH value of between 4.0 and 9.0 and a concentration of between 10 and 200g/L, the crystallization temperature is controlled to be between 10 and 40 DEG C, the stirring rotating speed is controlled to be between 10 and 500r/min, the filtration is performed after the crystallization is finished, the same organic solvent is used to wash, and xylobiose crystals can be obtained after vacuum drying. The method has steady crystallization yield, improves the quality of products, improves the appearance and the particle homogeneity of the products, has simple and convenient operation and good repetitiveness, and is suitable for mass production.