The invention discloses a method for using Chinese herbal medicine to prevent fish disease in aquaculture. The method for using the Chinese herbal medicine to prevent the fish disease in the aquaculture includes steps that 1) preparing medicine, wherein the medicine is composed of 3 to 5 grams of sweet wormwood, 1 to 3 grams of common andrographis herb, 1 to 3 grams of fructus forsythiae, 2 to 5 grams of light yellow sophora root, 3 to 5 grams of Chinese thorowax root, 2 to 5 grams of eucalyptus leaf, 2 to 4 grams of Chinese gentian, 1 to 3 grams of Chinese mugwort leaf and 1 to 3 grams of apocynum venetum; 2) arranging a framework-shaped feeding region in a fishpond; 3) putting the medicine in a mesh bag to obtain a Chinese herbal medicine hanging bag; hanging the Chinese herbal medicine hanging bag on the framework-shaped feeding region, and controlling the depth of the Chinese herbal medicine hanging bag in the water. When feeding, most of fishes in the fishpond gather at the feeding region, and the fishes wear and collide the Chinese herbal medicine hanging bag to promote the release of the medicine in the Chinese herbal medicine hanging bag so as to prevent the fish disease.