The invention discloses a deep sea deformation gap automatic compensation clamper. The deep sea deformation gap automatic compensation clamper comprises water bag rubber; a support cylinder barrel anda guide cylinder barrel are relatively mounted in the water bag rubber; a water bag front cover is mounted at the end part of the support cylinder barrel through locking screws, and a water bag backcover is mounted at the end part of the guide cylinder barrel through fastening pieces, so that water bag cavities are formed in the support cylinder barrel and the guide cylinder barrel; a water cylinder barrel is mounted at the back end of the water bag back cover; a back end cover is mounted at the end part of the water cylinder barrel through fastening pieces; a piston is mounted in the watercylinder barrel; a piston rod extends out from the middle part of the piston; and the piston rod penetrates through a through hole at the middle part of the water bag back cover. The deep sea deformation gap automatic compensation clamper further comprises a pressure-resistance barrel; and an input end of the pressure-resistance barrel communicates with the water cylinder barrel through a balancevalve. The deep sea deformation gap automatic compensation clamper compensates deformation gaps without needing external power sources, is wide in gap compensation range, can provide stable clamping force, and is stable and reliable in work.