The invention discloses detoxing and slimming biscuits and a making method thereof. The biscuits are made of the following raw materials: wheat flour, white kidney bean flour, wheat dietary fiber, soybean peptide powder, psyllium seed husk, konjac flour, semen pruni powder, vegetable oil, white granulated sugar, whole wheat flour, soybean protein isolate and skimmed milk powder. On the basis of reasonable use of the functional characteristic of resistance of resistant dextrin to digestive enzymes, the biscuits cannot be digested and absorbed in the digestive tract and can directly enter the large intestine. Therefore, the biscuits play various physiological roles of the dietary fiber and can have effects of lowering blood sugar, reducing blood fat, and maintaining the intestinal tract andthe like due to the characteristics of high digestion tolerance, low glycemic index, low insulin index, low calorie, high dissolubility and the like.