A dilution filter apparatus, comprising: a sampling component , a top cover and a sample tube , whereby the sampling component is assembled on the top cover ; whereby the sampling component assembled on the top cover is placed in the sample tube , and the top cover is sleeved on a top end of the sample tube causing the top cover and the sample tube to be in threaded fastening connection and the sample tube is sleeved outside the sampling component ; whereby a through hole is formed in the center position of the top cover ; whereby the sampling component comprises a connecting cylinder and a sampling part, the sampling part is concentrically connected with the connecting cylinder ; whereby the sampling part is configured for collecting suspension; characterized in that : the connecting cylinder of the sampling component is concentrically and rotatably connected with the top cover , so that the connecting cylinder , after being mounted, can freely rotate around a common axis of the connecting cylinder and the through hole of the top cover , and can drive the sampling part to rotate to stir suspension; whereby the sampling part further comprises a suspension collecting chamber and a plurality of suspension collecting windows communicated with the suspension collecting chamber ; whereby two suspension collecting windows are arranged at two opposite walls of the suspension collecting chamber respectively, each suspension collecting window is provided with a filter net and the filter nets arranged on different suspension collecting windows are different in aperture; whereby the sampling part is provided with a plate extending out in a vertical direction to a plane where the filter net is located for each of the filter nets , the plate extending out is configured to prevent the suspension from directly impacting the filter nets to cause blockage. a sampling component , a top cover and a sample tube , whereby the sampling component is assembled on the top cover ; whereby the sampling component assembled on the top cover is placed in the sample tube , and the top cover is sleeved on a top end of the sample tube causing the top cover and the sample tube to be in threaded fastening connection and the sample tube is sleeved outside the sampling component ; whereby a through hole is formed in the center position of the top cover ; whereby the sampling component comprises a connecting cylinder and a sampling part, the sampling part is concentrically connected with the connecting cylinder ; whereby the sampling part is configured for collecting suspension; the connecting cylinder of the sampling component is concentrically and rotatably connected with the top cover , so that the connecting cylinder , after being mounted, can freely rotate around a common axis of the connecting cylinder and the through hole of the top cover , and can drive the sampling part to rotate to stir suspension; whereby the sampling part further comprises a suspension collecting chamber and a plurality of suspension collecting windows communicated with the suspension collecting chamber ; whereby two suspension collecting windows are arranged at two opposite walls of the suspension collecting chamber respectively, each suspension collecting window is provided with a filter net and the filter nets arranged on different suspension collecting windows are different in aperture; whereby the sampling part is provided with a plate extending out in a vertical direction to a plane where the filter net is located for each of the filter nets , the plate extending out is configured to prevent the suspension from directly impacting the filter nets to cause blockage. <EOS>