Underwater dry-type repairing work cabin

The invention relates to an improvement on the underwater tube and cable maintainer, especially providing an underwater dry maintain cabin. Wherein, it is in thin-wall cylinder structure, without top and bottom, which is connected to the diver via lifting cylinder; said cabin is a sealing pressure cabin, whose pressure can be adjusted according to the water depth. And it is formed by maintain cabin, lifting cylinder, ejection system, pump system, and sealing device. The invention is characterized in that: it can be mounted on the diver with self navigation ability, to process the maintenance without working ship; and said cabin can dive into sea bed, via the lifting cylinder, to maintain the embedded cable and tube.