An industrial aquaculture water-pollutant separating and filtering apparatus, comprising a main barrel (13), multiple water-pollutant separation and filtering apparatuses disposed in parallel within the main barrel (13) at a lower part, and multiple layers of filter material (12b) disposed within the main barrel (13) at an upper part, a water-pollutant separation and filtering apparatus comprising: an outer barrel (1) and an inner barrel (5) disposed within the outer barrel (1); a top part of the outer barrel (1) is provided with a water inlet pipe (2) and a water outlet pipe (3), and a bottom part of the outer barrel (1) is provided with a pollutant discharge pipe (4); a top part of the inner barrel (5) is closed, and a bottom part has mounted thereon a funnel structure (6) having a gradually decreasing diameter, an opening (7) of the funnel structure (6) facing the pollutant discharge pipe (4) and having on a side wall thereof multiple holes or slots; the water inlet pipe (2) has mounted thereon a rotary di
