The invention relates to the technical field of aquaculture, in particular to a treatment method for reducing the content of chloromycetin in fish bodies. Fishes reaching the commercial specification are fished, and the fished commercial fishes are subjected to temporary rearing treatment and then appear on the market to be sold. In the temporary rearing process, workers conduct feeding of toxin expelling adsorption fodder every day, and the toxin expelling adsorption fodder is manufactured with sodium bentonite, corncobs, medicine-level polyvinyl alcohol, vegetable sponge extracts and straw mushroom residue extracts. According to the treatment method, the residue amount of the chloromycetin in the fish bodies can be reduced, and the commercial fishes reach the safety edible standard.