Reinforcing agent for improving immunity of aquatic animals and preparation method and application thereof

The invention discloses a reinforcing agent for improving immunity of aquatic animals. The reinforcing agent comprises the following components, by mass concentration: 10 to 20 g/L of broccoli stem and leaf hydrolysate, 15 to 20 g/L of concentrated molasses fermentation liquor, 60 to 100 mg/L of vitamin E, 5 to 8 g/L of a nitrogen source, 3 to 5 g/L of a phosphorus source, 1 to 2 g/L of a potassium source, 3 to 5 g/L of high-activity humic acid and 15 to 20 g/L of haematococcus pluvialis powder. In addition, the invention further discloses a preparation method and application of the reinforcing agent. The reinforcing agent has characteristics of good capability of treating both symptoms and root causes, high safety, no toxicity, no drug resistance, no pollution, no residue and the like, has effects of inhibiting bacteria and resisting bacteria, and is capable of improving the immunity of aquatic animals, resisting bacteria, preventing and treating parasites, resisting viruses and the like. The reinforcing age