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This invention discloses a sewage filtration device and treatment method for river management, relating to the field of sewage filtration technology. It includes an outer casing, a filtration component, a collection component, and a chemical treatment component. The filtration component includes a filter belt, and the collection component includes a collection box with several connecting pipes at its bottom. A switching mechanism is located inside the outer casing. The chemical treatment component includes a water pump, a first liquid tank, a second liquid tank, and a chemical tank. A first control mechanism is located inside the second liquid tank, and a second control mechanism is located inside the first liquid tank. This invention uses several collection boxes mounted on a rotating shaft to facilitate automatic switching of the collection boxes. During switching, it facilitates the compression and dewatering of solid impurities inside the collection boxes. A dosing component allows for the automatic addition of chemicals to the second liquid tank, and an aerator ensures thorough mixing of the sewage and chemicals.