Rotatable telescopic steel pipeline for smoke dust collecting device

The invention discloses a rotatable telescopic steel pipeline for a smoke dust collecting device. The rotatable telescopic steel pipeline comprises a first straight pipe, and a smoke inlet is formed in the first straight pipe; a flue gas outlet is formed in the fixed straight pipe; rotating joints are arranged at the two ends of the telescopic pipeline, and the two ends of the telescopic pipeline are connected with the first straight pipe and the fixed straight pipe through the rotating joints correspondingly. According to the telescopic pipeline, the rotating joints are arranged at the joint of the first straight pipe and the telescopic pipeline, and the rotating joints are arranged at the joint of the fixed straight pipe and the telescopic pipeline; the joint of the first straight pipe and the telescopic pipeline and the joint of the fixed straight pipe and the telescopic pipeline can rotate relatively, the telescopic pipeline can stretch out and draw back, the function that the pipeline freely rotates and