The invention provides a black fungus chewing tablets and a preparation method thereof, wherein the black fungus chewing tablets have functions of reducing blood fat, reducing blood glucose, preventing dental caries and improving functions of intestines and stomachs. The black fungus chewing tablets includes, by weight, 25-35% of black fungus powder planted on logs, 45-62% of a filling agent, 11-15% of a binding agent, 0.2-1.6% of a corrective agent and 1-3% of a lubricant, wherein the filling agent is a mixture composed of one or more of skimmed milk powder, lactose, xylitol, mannitol, modified starch, dextrin, [beta]-cyclodextrin and microcrystalline cellulose. The invention provides the black fungus chewing tablets and the preparation method thereof. Black fungus functional chewing tablets, which are sour-sweet and delicious in taste and is unique in flavors, are prepared. The chewing tablets have functions of reducing blood fat, reducing blood glucose, preventing dental caries and improving functions of intestines and stomachs. A series of products of black fungus is enriched. Transformation approaches of the black fungus resources are increased. A new method for further deep processing the black fungus is provided. The chewing tablets are in conformity with a functional, natural and diversified international developing trend in foods and have a broad market development prospect.