Municipal building drainage energy-saving device

The utility model discloses a municipal building drainage energy-saving device, and relates to the technical field of municipal building drainage, the municipal building drainage energy-saving device comprises a drainage device body, the drainage device body comprises a drainage pipeline, the bottom end of the drainage pipeline is provided with an energy-saving assembly, and the top end of the interior of the drainage pipeline is detachably provided with a filtering assembly. And a flow guide unit and a purification unit are arranged in the drainage pipeline. By arranging the filter screen plate, particulate matters in rainwater can be blocked, the filter screen plate is in an inclined state, the particulate matters flow into the dust collection box along the inclined direction in cooperation with the dust discharge port, and the rainwater flows downwards at meshes of the filter screen plate, so that the purpose of filtering the particulate matters in the rainwater is achieved; the purification unit is arrang