NOVELTY - Treating potato product processed wastewater comprises: pumping the wastewater of processing potato product directly into primary vacuum filter, removing most of suspended matter efficiently by vacuum filter; adding the water from the primary vacuum filter and flocculant, then feeding into a secondary vacuum filter; feeding the water filtered by secondary vacuum filter into an oxidation pond for aeration treatment, changing content of dissolved oxygen; discharging the precipitate produced by aeration precipitation into precipitate processing system to produce feed and organic fertilizer.    USE - The method is useful for treating potato product processed wastewater.    ADVANTAGE - The method reduces the difficulties in the sewage treatment process, reduces the operating cost, and is economical.    DETAILED DESCRIPTION - Treating potato product processed wastewater comprises: pumping the wastewater of processed potato product directly into primary vacuum filter with 150-250 meshes, efficiently removing most of the suspended matter by vacuum filter and reducing the chemical oxygen demand (COD) value of wastewater by 50%; adding water from the primary vacuum filter and flocculant in a weight ratio of 4000-6000:1, then feeding into a secondary vacuum filter with 200-300 meshes, where the flocculant is prepared by mixing and stirring polymeric aluminum and polyacrylamide in the weight ratio of 50-100:1; removing large amounts of water from cell sap by passing through the secondary vacuum filter; absorbing all the insoluble substances on surface of filter, which can be used for cleaning after production of refined potato protein and animal feed fermentation agent, and the COD value of wastewater is reduced by 20% again by passing secondary vacuum filter; feeding the water filtered by secondary vacuum filter into an oxidation pond for aeration treatment, changing the content of dissolved oxygen, setting supernatant liquor of aeration tank at 30% by pump, extracting the clean liquor for the next processing step; discharging the precipitate produced by aeration precipitation into precipitate processing system to produce feed and organic fertilizer, and feeding the wastewater after processing into agricultural base used for organic fertilizer.