The invention provides a seawater pressure balancing and compensating type rotating shaft moving seal which comprises a sealing base installed on an end cover of an underwater operation device, a sealing output shaft connected with a device output shaft by a key, a front end cover arranged on the sealing base and a stationary seal ring positioned on the sealing base; wherein, the sealing output shaft is connected with a centrifugal impeller and a movable seal ring by a connecting key, the movable seal ring is fixedly connected with the centrifugal impeller, the back of which is provided with a back washer, the sealing base is provided with an inlet, an outlet and a water channel, and an O-shaped ring is respectively arranged between the sealing base and the end cover of the underwater operation device, between the stationary seal ring and the sealing base, and between the movable seal ring and the sealing output shaft. The rotating shaft moving seal can be installed in tools such as an underwater cutter, a sander, a piercer and the like as well as devices such as a deep water propeller, etc. The rotating shaft moving seal has the functions of balancing and compensating seawater pressure realizes the operation at any depth under the seawater, is applied to a shaft in high speed rotation and is not affected by seawater pressure.