The invention relates to a coarse cereal shish kebab and a preparation method thereof. The coarse cereal shish kebab is characterized by being prepared by the following raw materials in parts by weight: 400-440 parts of mutton, 2-3 parts of xylaria nigripes, 1-1.5 parts of radix peucedani, 2-2.2 parts of myrrh, 0.8-1 part of melon flower, 1.8-2.2 parts of banyan leaf, 1.2-1.4 parts of spiny jujube flower, 1.5-1.6 part of wild lettuce, 0.9-1 part of allium caelureum, 3-4 parts of sesame paste, 7-9 parts of millet, 9-10 parts of black rice, 8-9 parts of ormosia, 4-5 parts of prosomillet, 2-3 parts of wheat gluten, 15-20 parts of fishbone, 10-12 parts of potato, 4-5 parts of milk tea, 3-3.5 parts of white spirit and 10-11 parts of nutritive additive. The coarse cereal shish kebab maintains the nutrition of the mutton and effectively integrates flavors of the millet, the black rice, the fishbone and the like, the flavor of the shish kebab can be significantly improved, the nutrition of the shish kebab is enriched, the taste penetrates into the mutton through curing and frying, the mutton is tender and elastic, and the coarse cereal shish kebab has effects of calming nerves, reducing blood pressure, expelling wind, clearing heat, improving eyesight, detoxifying, activating yang and invigorating a stomach.