Composition for degrading algae toxin in water body and preparation method thereof

The invention discloses a composition for degrading algae toxin in a water body and a preparation method thereof. The composition comprises the following components in parts by weight: 60 to 80 parts of Chinese gall, 10 to 20 parts of terminalia, and 10 to 20 parts of pomegranate rind. The preparation method comprises the steps of grinding, soaking, and pulp refining. The composition for degrading algae toxin in a water body provided by the invention can kill microcystis and combine with the microcystis toxin with a biological activity to form an insoluble compound, thus the toxicity of microcystis is removed, no residual toxin is left in the water, so the composition has the advantages of environment-friendliness, no drug resistance, and no irritability. The method provided by the invention is easy and practicable, the prepared composition well solves the problem of harms caused by algae toxin to aqua-cultured organisms, greatly reduces the morbidity rate of the aqua-cultured organisms, increases the output, and has a very vast market prospect.