The invention discloses a sewage discharge pipeline, and belongs to the technical field of sewage treatment equipment. The sewage discharge pipeline comprises a main pipeline and a sewage cleaning mechanism, wherein the sewage cleaning mechanism is arranged on the main pipeline, the sewage cleaning mechanism comprises a sewage cleaning cavity, the sewage cleaning cavity is formed in the main pipeline, an exhaust pipe is arranged on the top of the sewage cleaning cavity, a sewage discharge pipe is arranged at the bottom of the sewage cleaning cavity, and a valve is arranged on the sewage discharge pipe; a fan and a deodorization layer are arranged in the exhaust pipe in sequence, a branch pipeline is arranged on the side of the sewage cleaning cavity, the branch pipeline is used for discharging sewage after the sewage is cleaned, the sewage cleaning mechanism is arranged on the branch pipeline again in sequence, and the extension part, which extends from the sewage cleaning cavity, of the main pipeline is connected with the branch pipeline. According to the sewage discharge pipeline, the sewage cleaning mechanism is arranged on the main pipeline, and the sewage is deposited by the sewage cleaning cavity, so that sediments in the sewage are intensively discharged, and then the sewage is discharged into a river so as not to pollute the environment; and additionally, the sewage cleaning mechanism is installed on the branch pipeline again for sedimentation treatment for many times, so that the sediments in the sewage are intensively discharged preferably so as not to cause pollution.