Medicinal composition for preventing and treating turbot white excrement disease

The invention relates to a medicinal composition for preventing and treating a turbot white excrement disease. The medicinal composition comprises the following components in percentage by mass: 40-60 percent of mequindox, 20-30 percent of florfenicol and 20-30 percent of neomycin. The medicinal composition further comprises chlorine dioxide. According to the medicinal composition, a chlorine dioxide medicinal bath of an appropriate concentration is used together with an oral medicinal bait. The medicinal composition is a compound comprehensive medicinal composition, can be effectively used for preventing and treating the white excrement disease at the fish larvae period of turbots and the culturing period of commodity fishes, and can be used for curing the turbot white excrement disease occurring at different regions caused by multiple pathogens. The medicinal composition is easy to use, has a low dosage, and is low in cost; and the curative rate can be over 95 percent.