Ship cabin purification device

The invention relates to the technical field of ship cabin air purification treatment, and particularly discloses a ship cabin purification device which comprises a box body, the box body is sequentially provided with a first cavity, a second cavity, a third cavity and a fourth cavity from bottom to top, the first cavity is internally provided with a composite filtering module, the second cavity is internally provided with a photocatalyst treatment module, and the fourth cavity is internally provided with a photocatalyst treatment module. The third chamber is provided with an air quality monitoring module, the fourth chamber is internally provided with a mute fan, the side wall of the box body is provided with an air inlet hole corresponding to the first chamber, and the top of the box body is provided with an exhaust grille; during purification, the silent fan is started, so that negative pressure is formed in the box body, and gas in a cabin enters the first cavity through the air inlet hole, then sequentia