The invention discloses a technique of using a solvent crystallization method to prepare asiaticoside with high purity, which has the technique steps as follows: 1) the asiaticoside is solid-liquid separated after being dissolved by a solvent I so as to obtain an asiaticoside solution; and 2) a solvent II is added in the asiaticoside solution for crystallization, two parts of solid substances andcrystallized mother liquor are obtained after solid-liquid separation, and finally asiaticoside products with high purity can be obtained by vacuum drying the solid substances. Primary crystallization of the invention can prepare the asiaticoside products with purity of more than 90 percent, and the yield of the asiaticoside can reach more than 80 percent. A repeated crystallization mode can be used for preparing asiaticoside products with higher purity, for example, the asiaticoside products with purity of more than 95 percent can be obtained by twice crystallization. In addition, the crystallized mother liquor is rich in asiaticoside A and asiaticoside B, and can be used further. The technique has the advantages of simple process, low production cost, less pollution, high asiaticoside product yield, high purity and the like, and is suitable for industrialization production.