Ship lifting type sea chest device

The invention discloses a ship lifting type sea chest device, and relates to the technical field of ship engineering. The ship lifting type sea chest device comprises a seawater tank provided with a first plugging plate and a second plugging plate, a ship body seawater suction pipe located between the first plugging plate and the second plugging plate and connected with a seawater header pipe, anda lifting cylinder connected with the inner top wall of the seawater tank through a first driving mechanism. An upper seawater suction pipe and a lower seawater suction pipe are arranged on the sidewall of the lifting cylinder in a penetrating mode. A through hole is formed in the bottom of the seawater tank. When the lifting cylinder extends out of the seawater tank, the upper seawater suctionpipe is in butt joint with the ship body seawater suction pipe, and the lower seawater suction pipe is plugged by the second plugging plate; and when the lifting cylinder retracts into the seawater tank, the upper seawater suct