The invention relates to a preparation method of solid low-sugar ginger tea. Full gingers are pressed to obtain partial juice, left gingers are quickly dried through microwaves, edible alcohol is used for soaking the dried left gingers so as to extract ginger oil resin, the ginger juice and the ginger oil resin are mixed to prepare microcapsule powder, and then the microcapsule powder is mixed with crystallized sugar alcohol to prepare the solid low-sugar instant ginger tea. According to the preparation method, ingredients of raw gingers can be maximally utilized and protected, the productionefficiency also can be improved, and the production cost can be reduced; the produced solid low-sugar instant ginger tea belongs to categories of low-sugar food and low-calorie food; the procedures are coherent and simple, technique conditions are moderate, the ginger juice is completely used, and the edible alcohol for extracting the ginger oil resin can be condensed and recycled; and the solid low-sugar instant ginger tea powder has characteristics of fineness, mobility, particular fragrance of the ginger, slight spice irritation, instant solubility, capability of being rapidly dissolved inhot water, stability in a drying state, and more than or equal to 90 percent of gingerol retention after being held in darkness for 6 months.