The invention discloses a deep diving operation supporting ship which comprises a bulbous bow, a working deck, a fully-rotating propelling plant, a lifting system, a saturation diving system, an air diving system and a remote control detection working system, wherein the bulbous bow is arranged on a ship foremost region, the working deck is arranged on a ship midship region and a ship tail region, the fully-rotating propelling plant is arranged on the ship tail region, the lifting system is arranged on the ship midship region through stand columns, the saturation diving system is arranged between the ship foremost region and the ship midship region, the air diving system is arranged on a ship side region, and the remote control detection working system is arranged on the ship side region. According to the deep diving operation supporting ship, the fully-rotating propelling plant can be arranged reasonably through the tail shaped line design, and the deep diving operation supporting ship has the advantages that all function regions are compact in structural layout and high in integration level.