It is well known that aquaculture wastewater has the characteristics of “three highs” (high ammonia nitrogen, high cod, and high ss), and it is difficult to treat and accompanied by foul odor. Among them, the five-day biochemical oxygen demand BOD5 ranges from 600 to 7000mg/L, and the COD concentration of the chemical oxygen demand can reach 13000 to 17000mg/L. The wastewater discharged by large-scale farms every day is large and concentrated, and there are heavy metals, Residual veterinary drugs and a large number of pathogens, etc., if discharged into the environment or directly used in agriculture without treatment, will cause serious pollution to the local ecological environment and farmland.