The invention discloses a ship with a changeable space. The ship includes a ship platform, an inflatable seat, an inflatable bed, a control panel, a vacuum inflating pump and air channel regulation and control equipment. Through setting of the control panel, the vacuum inflating pump and the air channel regulation and control equipment can control inflation or air suction of the inflatable seat and the inflatable bed which are fixed to the ship platform, and therefore the inflatable seat or the inflatable bed expands in volume after inflation and becomes a usable entity; after air in the inflatable seat or inflatable bed is exhausted, the volume of the inflatable seat or inflatable bed is reduced, and the space of the ship is not occupied. In this way, the spatial layout of the ship is changed, and demands of the ship for various use spaces under limited spaces are met.