As for this invention, the fall launch and retreival device and fall launch and retreival method of the dry dock system which can do the fall launch and retreival of on-board boat the high-speed cruise time of the ship are offered. The fall launch and retreival device on-board boat (10) has the accommodation possible stern dry dock (2), falls on-board boat outboard from stern opening of the dry dock, launch and retreival does on-board boat the penetration inside the dry dock of the outboard on-board boat with. The fall launch and retreival device has, the water conveyance device (11) the intake (12) from takes in the seawater around the ship, the outlet (13) from flows out into the dry dock. The backward water flow is formed inside the dry dock, this water flow flows out from stern opening of the dry dock outboard.
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