The high-pressure pipeline sealing airbag consists of an airbag body, a steel pull ring, a high-pressure air pipe, a pressure gauge, a three-way valve connected to the pressure gauge, and a spherical switch control valve. When the airbag is folded without pressure, it is placed in the pipeline that needs to be sealed. It is inflated into the airbag by connecting it to an air pump through a trachea, allowing the airbag to fully expand. The airbag is in full contact with the pipe wall, and the frictional force is greater than the upstream water pressure to complete the sealing operation. Widely applicable to various types of pipeline closed water tests, municipal pipeline maintenance, sealing, dredging, dredging, water blocking, plugging, drainage pipeline maintenance, sewage industry treatment, fire emergency repair and sealing construction, etc.