The invention discloses a pipeline connecting device, which comprises a pipeline, and further comprises a supporting pipe stretching out and drawing back in the pipeline. One end of the supporting pipe is connected with a connecting tip, and a jacking head is connected to the connecting tip and provided with a plurality of swinging jacking shafts; one ends of the jacking shafts are each provided with an extrusion block; a sliding jacking block is arranged in the jacking head, and sliding of the jacking block jacks sliding of the jacking shafts; a rotating second rotating shaft is arranged in the supporting pipe and drives the jacking block to slide; and the other end of the supporting pipe is connected with a control head which is provided with a rotating head, the rotating head drives thesecond rotating shaft to rotate, and thus the pipe connecting position can be jacked through the jacking head in the pipeline connecting process, so that the pipeline connecting effect is improved.