The invention discloses a swallowing protective agent and a preparation method thereof. The swallowing protective agent is prepared from the following raw materials in percentages by weight: 25-90% ofsticky food micro powder, 3-50% of soluble dietary fiber powder and 1-30% of an auxiliary material, wherein the sticky food micro powder comprises lotus root starch, okra powder, yam flour, tremellapowder and gracilaria powder; the soluble dietary fiber powder comprises inulin, isomaltose hypgather, fructo-oligosaccharide, galacto-oligosaccharide and xylooligosaccharide; the auxiliary material comprises sorbitol, erythritol, arabinose, xylitol, acerola cherry powder or extract thereof, momordica grosvenori powder or mogroside; and the invention also provides a preparation method of the swallowing protective agent. The swallowing protective agent has the fragrance of natural food, is comprehensive in nutrition and good in taste, does not contain colloid food additives, eliminates doubts and conflicts of consumers, does not contain starch, dextrin and the like, and avoids the phenomenon that blood sugar rises sharply after the swallowing protective agent is eaten; the swallowing protective agent is added into various cold and hot drinks and foods, is simple in use method and is suitable for patients with dysphagia to eat.