The invention relates to a Chinese herb composition capable of effectively treating the dark-thin syndrome of Scophthalmus maximus, wherein the Chinese herb composition comprises, by weight, 10-20 parts of rhus chinensis mill, 25-35 parts of pulsatilla chinensis (bunge) regel, 45-55 parts of cortex phellodendri, 15-25 parts of andrographis paniculata, 20-35 parts of angelica sinensis, 15-25 partsof codonopsis pilosula, 12-24 parts of honeysuckle, 10-20 parts of eucommia ulmoides, 8-15 parts of cortex fraxini, 6-15 parts of frankincense, and 2-5 parts of myrrh. According to the present invention, the components are subjected to scientific compatibility according to the traditional Chinese medicine principle of assistant and guide, the effective components of most of the herbs are subjectedto quantitative and semi-quantitative detection by using the modern scientific and technological means, and the prepared finished product can provide good treatment effect for the dark-thin syndromeof Scophthalmus maximus; various Chinese herbs acts synergistically, such that the inhibition effect on pathogen is enhanced, and the toxicity of the single herb is reduced; and the Chinese herb composition can significantly prevent and treat the dark-thin syndrome of Scophthalmus maximus, is the traditional Chinese medicine with characteristics of good treatment effect, no pollution, no residue and easy use, and is especially suitable for the large-scale industrial breeding of Scophthalmus maximus.