High-density complex for long-acting targeted cultivation of algae in water body and preparation method of high-density complex

The invention discloses a high-density complex for long-acting targeted cultivation of algae in a water body and a preparation method thereof, and relates to the field of aquaculture, the high-density complex comprises the following components by weight: 3-5 parts of a small material premix, 35-40 parts of sodium chloride, 1-3 parts of gelatinized starch, 40-50 parts of attapulgite, 3-7 parts of cement, 1-3 parts of a titanate coupling agent, 2-4 parts of molasses and 1-5 parts of purified water. The preparation method of the high-density complex comprises the following steps: sub-packaging the small premix, uniformly stirring the small premix with other components, adding molasses for humidity regulation and control, sub-packaging, pressing and forming, and sequentially carrying out plastic packaging, packaging and film wrapping. The high-density complex for long-acting targeted cultivation of algae in the water body can directionally cultivate diatom and chlorella, continuously release functional substances