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 3 times 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.