Drainage pipeline repairing device and construction method

The invention relates to the field of municipal drainage pipeline repairing technologies, in particular to a drainage pipeline repairing device and a construction method, and the drainage pipeline repairing device comprises a driving cylinder, a storage cylinder and a cleaning disc; the storage cylinder and the cleaning disc are installed at the two ends, away from each other, of the driving cylinder correspondingly. A pipeline repairing air bag is placed in the storage cylinder; the driving cylinder is provided with an ejection mechanism connected with the pipeline repairing air bag. A felt cylinder soaked by resin is wound on the peripheral side of the pipeline repairing air bag; the end, away from the driving cylinder, of the pipeline repairing airbag communicates with and is fixed to an air conveying pipe. A driving mechanism is mounted on the driving barrel and used for driving the cleaning disc to rotate around the axis of the driving barrel; a water conveying pipe is rotationally connected to the cente