Deep diving motor compensator

The invention relates to the technical field of compensators and discloses a deep diving motor compensator which is characterized in that a compensator cylinder is mounted outside a sliding sealing inner sleeve in a sleeved mode and is coaxially arranged with the sliding sealing inner sleeve, a first connecting seat and a second connecting seat are hermetically mounted at the two ends of an area between the compensator cylinder and the sliding sealing inner sleeve respectively, a sliding sealing assembly is mounted in a sliding cavity in a sliding and sealing mode and is of an annular structure with a through hole in the middle part, the outer ring surface of the sliding sealing assembly abuts against the inner ring surface of the compensator cylinder in the sliding and sealing mode, the sliding cavity is divided into a first cavity, close to the side of the first connecting seat, and a second cavity, close to the side of the second connecting seat, by the sliding sealing assembly, a metal bag is a tubular bo