The present invention discloses a health-care coarse cereal flour and a preparation method thereof. The health-care coarse cereal flour is prepared from the following raw materials: black beans, wheat, sorghum, colocasia esculenta, white fungus, trapa bispinosa, donkey-hide gelatin, dried orange peel, ginkgo biloba, ficus carica fruits, agropyron cristatum, plantago depressa, lithospermum erythrorhizon, angelica sinensis, polygonatum odoratum, strawberries, apples, water, aspergillus oryzae, and aspergillus niger, and the raw materials consists of the following components in parts by weight: black beans 12-22 parts, wheat 22-30 parts, sorghum 18-28 parts, colocasia esculenta 18-26 parts, white fungus 8-16 parts, trapa bispinosa 12-18 parts, donkey-hide gelatin 5-15 parts, dried orange peel 6-16 parts, ginkgo biloba 12-18 parts, ficus carica fruits 16-22 parts, agropyron cristatum 10-16 parts, plantago depressa 10-14 parts, lithospermum erythrorhizon 8-12 parts, angelica sinensis 10-16 parts, polygonatum odoratum 13-17 parts, strawberries 16-20 parts, apples 14-18 parts, water 60-90 parts, aspergillus oryzae 10-12 parts, and aspergillus niger 20-22 parts. The health-care coarse cereal flour is not only delicious, but also is rich in nutrition, and has advantages of benefiting blood and supplementing qi, clearing heat and clearing away toxins, promoting sleep, enhancing immunity, etc.