The invention belongs to the technical field of research and development of medicinal products and relates to a preparation method and use of a compound traditional Chinese medicinal preparation. The preparation method comprises: mixing 9 to 15 grams of panax root, 6 to 9 grams of Codonopsis pilosula, 6 to 9 grams of eucommia bark, 6 to 9 grams of Indian Buead, 6 to 9 grams of Chinese wolfberry, 10 to 15 grams of mushroom, 6 to 9 grams of indigowoad root, 6 to 9 grams of parslane herb and 3 to 5 grams of liquoric root; removing impurities from the mixture; drying or drying in the sun; crushing into 40 mesh powder; extracting for 4 to 5 hours with water in an amount which is 4 to 5 times that of the powder; filtering with gauze; treating the filter residue with water in an amount with is 3times that of the filter residue by the above steps and treating the filter residue with water in an amount with is 2 times that of the filter residue by the above steps; combining the filtrate obtained at three times; condensing the filtrate to make paste; adding corn starch into the paste to prepare a soft material; granulating by a No.1 sieve, drying, finishing granules and obtaining the compound traditional Chinese medicinal preparation. The product of the invention can promote the growth of red-crowned Wen fish.