Building drainage structure capable of reducing blockage

The invention discloses a building drainage structure capable of reducing blockage. The building drainage structure comprises a pipeline assembly, a mounting base, a transmission part and a chopping part, and a drainage channel is defined by the pipeline assembly; the mounting seat is connected to the pipeline assembly; the transmission part comprises a first pipe part and a transmission part, the first pipe part is rotationally connected with the mounting base and arranged in the drainage channel, a first conveying channel is defined by the first pipe part, and the transmission part is arranged on the inner wall of the first pipe part; the chopping piece comprises a second pipe part and a chopping part, the second pipe part is connected with the first pipe part, a second conveying channel is defined by the second pipe part, and the chopping part is arranged on the inner wall of the second pipe part. The transmission part does circumferential movement under the action of rainwater, the transmission part drive