Aquaculture sewage circulation purification method

The invention discloses an aquaculture sewage circulation purification method. According to the method, particulate matters in aquaculture sewage are filtered by a sewage filter box (3), sewage purification effects are improved, a filter plate (12) is fixedly mounted in the sewage filter box (3), the particulate matters are filtered by the filter plate (12), an opening (13) is formed in the top ofthe sewage filter box (3), the particulate matters in the sewage filter box (3) are conveniently taken out through the opening (13), a second water discharging pipe (14) is fixedly communicated withthe right side of the sewage filter box (3), and a biological purification box (4) is fixedly communicated with the other end of the second water discharging pipe (14). According to the method, the sewage purification effects are improved, soluble and colloid organic pollutants in the sewage are removed, harmful bacteria in the sewage are eliminated, organic matters in the sewage difficult to be oxidized and decomposed by microorganisms or a common oxidation method are adsorbed, water source waste rate is reduced, environment-friendly and saving effects are achieved, water circulation is achieved, and the method has the advantages of environmental friendliness and conservation, so that the method effectively solves the problems that water resources are wasted and ecological environments are destroyed due to existing sewage discharge.