Composite bacillus preparation for improving marine culture water environment and preparation thereof

The invention discloses a composite bacillus preparation applied to improving the aquatic environment of mariculture, and a making method thereof. The preparation is made by mixing Bacillus subtilis, Bacillus licheniformis, Bacillus cereus and Bafillus natto according to certain ratio, and under room temperature, the active microorganism is in resting state and the preparation is stable and easy to be preserved. After the composite bacillus preparation is put into mariculture water, the dormant bacteria can be back to normal quickly, degrade residual bait, dejection, fertilizer, biological residual bodies and other organic contaminant fast, reduce the content of ammonia nitrogen, nitrite and COD in the culture water and reproduce to be predominant bacteria in the water quickly so as to further restrain the putrefying bacteria from reproduction, improve the environment of the culture water and purify the water. The preparation of the invention is safe, contains no pollution nuisance and residual, can obviously improve the environment of the culture water, and meanwhile, the immunity of aquatic livestock can be improved.