The invention provides a Chinese herbal medicinal feed additive for improving the quality of carp flesh, and the Chinese herbal medicinal feed additive is prepared from the following raw material drugs in parts by weight: 2 to 4 parts of eucommia, 2 to 4 parts of dandelion, 3 to 5 parts of angelica root, 3 to 5 parts of yam, and 3 to 5 parts of chrysanthemum. A preparation method of the additive comprises the following steps: weighing the eucommia, the dandelion, the angelica root, the yam and the chrysanthemum Chinese herbal medicinal slices in weight proportion, and respectively crushing into coarse powder; collecting volatile oil from the chrysanthemum coarse powder by using a distillation method; immersing the eucommia, dandelion, angelica root and yam Chinese herbal medicinal coarse powders with water, and decocting for three times with the distilled chrysanthemum dreg with slow fire; combining the three filtrates, and heating to obtain concentrated liquid; and combining the volatile oil and the concentrated liquid, adding antiseptic and water quantitatively, uniformly stirring, filtering, filling and sterilizing to obtain the Chinese herbal medicinal feed additive. The Chinese herbal medicinal feed additive is used for improving the quality of carp flesh, and has the advantages of convenient use, low cost, good effect, safety and non toxic or side effect.