Online under-pressure leak repairing device for gas pipeline

The utility model discloses an online under-pressure leak repairing device for a gas pipeline, relates to the technical field of leak repairing devices, and aims to improve the phenomenon that after the gas pipeline is used for a long time, the wall of the pipeline is thinned due to corrosion and is damaged to cause leakage, and in order to guarantee production and operation, the pipeline also needs to be normally used during repairing. The pipeline leakage repairing device comprises a first leakage repairing semicircular pipe, a T-shaped limiting groove is formed in the inner wall of the first leakage repairing semicircular pipe, a sliding block is slidably connected to the inner wall of the T-shaped limiting groove, and a leakage stopping block is arranged on the upper surface of the sliding block; the top of the first leakage repairing semicircular pipe is movably connected with the second leakage repairing semicircular pipe through the connecting bolt, the leaking stoppage block is plugged at the pipeline