The utility model discloses a boats and ships hydraulic pressure slidingtype watertight door, including a door base, door leaf and the setting doorjamb in door base top both sides, one side that two doorjamb's top is close to each other is fixed with the hydro -cylinder, and the sliding tray has been offered to one side that two doorjamb are close to each other, and the top of sliding tray extends to doorjamb's top, lie in respectively an inner wall of the sliding tray of base top both sides respectively with the both sides sliding connection of door leaf, there is the second fixed block both sides of door leaf bottom all welding, and the piston rod of second fixed block and hydro -cylinder is connected, seted up on the door base and placed the chamber, sliding connection has two first sliders on placing the bottom inner wall in chamber, and two first sliders set up relatively. The utility model discloses economical and practical, the sealed pad among the boats and ships hydraulic pressure slidingtype watertight door on door leaf and the door base carries out in close contact with for the door leaf is better with the leakproofness of door base, and the door leaf has better buffering effect when closing.