Water drainage open channel for treating and controlling runoff of rainwater of residential areas in baffling manner

The invention discloses a water drainage open channel for treating and controlling runoff of rainwater of residential areas in a baffling manner, which comprises a water drainage open channel body arranged under a green space of a residential area or/and beside a road. The top of the water drainage open channel body is rectangular while the bottom of the water drainage open channel body is inclined, a water inlet is arranged at a short edge of the water drainage open channel body, and a water outlet is arranged on another short edge of the water drainage open channel body. The water drainage open channel is characterized in that an external water drainage ditch is arranged in the water drainage open channel body along a long edge; and a plurality of baffling galleries which are perpendicular to the external water drainage ditch and are connected end to end are disposed in the water drainage open channel body. The baffling type water drainage open channel which is coordinated with a water drainage ditch of the residential area is designed besides green buildings, green spaces and roads of the residential area, so that a rainwater runoff path is elongated, emergence time of rainwater flow peak of the residential area is delayed, the time for the rainwater to flow into an urban rainwater pipe network is delayed, flood drainage pressure of the urban rainwater pipe network when in storm days is reduced, and possibility of urban waterlogging is reduced.