Megalobrama amblycephala disease-resistant growth promoting agent and preparation method and application of megalobrama amblycephala disease-resistant growth promoting agent

The invention relates to a meglobrama amblycephala disease-resistant growth promoting agent and a preparation method and application of the megalobrama amblycephala disease-resistant growth promoting agent, and belongs to the technical field of aquatic compound feed additives. According to the preparation method of the megalobrama amblycephala disease-resistant growth promoting agent, the extracts of galla chinensis, dimethyl potassium formate, L-carnitine and carrier of the L-carnitine are taken to be fully mixed and smashed to be prepared into dry powder. The megalobrama amblycephala disease-resistant growth promoting agent has the advantages of being stable in feed source, simple in preparation, broad in material drawing and low in cost. The meglobrama amblycephala disease-resistant growth promoting agent comes out of a mechanism of fish body disease-resistant growth promoting agent, the disease-resistant growth promoting agent is not only supplemented with Chinese herbal medicine, but also supplemented with western medicine dimethyl potassium formate, and the immunocompetence of the fish body can be improved through the Chinese and western combined medicine. When the megalobrama amblycephala disease-resistant growth promoting agent is used, the immunity and the antioxidant capacity of the fish body can be improved, the aeromonas hydrophila resistant capability can be improved, and the growth of the megalobrama amblycephala can be promoted.