The invention relates to a production technology of high-purity stevioside. The technology is characterized in comprising the steps of: an extraction step, a flocculation step, a membrane filtration step, an adsorptive separation step, a reverse osmosis concentration step, a desalting and de-coloring step, and a recrystallization step. The technology provided by the invention has advantages that: the stevioside is a completely safe foodstuff additive with no toxicity, no side effect, no teratogenic effect, no mutagenic effect, no carcinogenic effect, refreshing taste, good taste, high purity, and high sweetness. Therefore, requirements of people can be satisfied. During a production process of stevioside, no chemical method or chemical raw material is adopted, and no pollutant is discharged. A small amount of waste residual can be comprehensively used as a bio-fertilizer. Stevia leaf is a good organic fertilizer rich in organics, and can be used for improving and fertilizing soil. Therefore, a waste pollution problem is solved from the source.