Non-stop in-pipeline hydraulic plugging device and use method thereof

The invention relates to a non-stop in-pipeline hydraulic plugging device and a use method thereof and can improve the sealing effect of a to-be-plugged pipeline. A tensioning hydraulic cylinder is mounted in a plug of the device, and a tensioning piston rod of the tensioning hydraulic cylinder is connected with a plug mounting seat through a swing rotation shaft; one end of each of two hydraulicrubber hoses is connected with an oil port of a manual reversing valve fixed outside a plugging header, the other ends are connected with an oil inlet A and an oil inlet B on the tensioning piston rodrespectively, and the manual reversing valve is connected with a hydraulic power source; when the plug is in an initial mounting position, the outer diameter of the plug is smaller than the inner diameter of the to-be-plugged pipeline, and after the plug works in a working position, outer diameter of the plug is larger than the inner diameter of the to-be-plugged pipeline. The device is not affected by objective factors s