The invention relates to a plugging device for a gas pipeline. The plugging device for the gas pipeline comprises an outer pipe, a guiding pipe, and a lower blocking rod. The lower blocking rod stretches into the end portion of the guiding pipe and is fixedly connected with a bladder plugging device, a sealed first equilibrium cavity is formed between the guiding pipe and the outer pipe, a sealedsecond equilibrium cavity is formed between the lower blocking rod and the guiding pipe, the first equilibrium cavity is provided with a first equilibrium opening, and the second equilibrium cavity isprovided with a second opening; the bladder plugging device is comprised of the connecting position of a first bladder, a second bladder, and the lower blocking rod, two ends of the first bladder andthe second bladder are all provided with bladder joints, and a guiding spring is arranged between the two bladder joints of the second bladder; the lower plugging rod is provided with a first ventilation joint which communicates with the first bladder and a second ventilation joint which communicates with the second bladder. The plugging device for gas pipeline guarantees that normal use of gas is not affected during maintaining the pipe, and waste of gas resources can be avoided and the environment is not polluted.