The invention discloses sugar-free starch gel candy and a preparation method thereof, and belongs to the technical field of production of candy. A formula of the candy comprises the following components: 5 to 20 percent of starch, 50 to 90 percent of one or more of sorbitol, mannitol, xylitol, maltitol, isomaltitol, galactitol and erythritol, 0 to 0.1 percent of edible acid, 0 to 5 percent of edible lipid, 0 to 0.02 percent of edible pigment, 0 to 2.0 percent of edible essence, and 0 to 20 percent of fruit juice or vegetable juice. The preparation method comprises the following steps of: proportioning, performing acid hydrolysis, sugaring off, adding auxiliary materials for blending, pouring, forming, demoulding, finishing, packing and the like. The sugar-free starch gel candy prepared by the method does not contain sucrose, and is suitable for special patients suffering from diabetes, hypertension and the like to eat. The sugar-free starch gel candy has a good forming effect, is high in chewing strength, non-sticky for teeth and knives, easy to cut and difficult to crystallize, separate out and fade, avoids decayed teeth, and facilitates industrialized production; and the quality guarantee period of the candy can reach 24 months.