The invention discloses a pipeline movable joint convenient to fasten and a fastening device. The pipeline movable joint convenient to fasten comprises a nut and two joint bodies connected through thenut. The joint connecting ends of the two joint bodies are internally provided with sealing rings. The pipeline connecting ends of the two joint bodies are provided with internal threads. The nut iscylindrical. The outer surface of the nut is provided with turbine teeth. Meanwhile, the pipeline movable joint convenient to fasten is provided with the fastening device used for fastening the movable joint. The fastening device comprises a base and a worm arranged on the base. The worm is engaged with the turbine teeth of the nut. According to the pipeline movable joint and the fastening device,an improvement is made on an original pipeline movable joint fastening mode; the problems that the pipeline movable joint and the fastening device are mounted in a narrow and small position and fastening is difficult due to limitation of the fastening mode are effectively solved; when leakage occurs to the movable joint when a passenger car runs, the joint can be dismantled and fastened conveniently; and meanwhile, the pipeline movable joint can be used for connection and sealing of general pipelines.