The invention discloses cereal biscuits and a making method thereof. The cereal biscuits are prepared from, by weight, 30-40 parts of coarse rice powder, 40-60 parts of honey, 30-50 parts of bran powder, 40-50 parts of soyabean oil, 30-50 parts of oat powder, 6-10 parts of hawthorns, 30-50 parts of sweet potato powder, 10-20 parts of eggs, 20-40 parts of Chinese yams, 8-12 parts of semen cassiae, 10-12 parts of saccharose, 8-10 parts of bighead atractylodes rhizome, 3-5 parts of table salt and 50-70 parts of water. According to the cereal biscuits, the cereals are rich in nutrition, the added Chinese yam contains rich gulcomannan to achieve smooth defecation, faeces can be softened, the pH in the intestinal tract is reduced, and intestinal tract pathogenic bacteria are obviously restrained. The added bighead atractylodes rhizome, hawthorns and the like are rich in nutrition and can further promote intestinal digestion. Thus, the obtained biscuits are rich in nutrition, free of preservative addition, good in taste and capable of cleaning the intestinal tract and promoting digestion.