The invention discloses a box column for a ship, and belongs to the technical field of ship parts. The box column for the ship comprises a support plate, first convex plates, first steel cylinders, first concave plates, a support bar, a steel inner barrel, a steel outer barrel, a tripod, a second convex plate, a second steel cylinder, a third steel cylinder, a second bolt, an arc-shaped tripod, a supporting plate, a first bolt, a side plate, a bracket and a bottom plate; the steel outer barrel is welded and mounted between the bottom plate and the support plate, the steel inner cylinder is arranged in the steel outer barrel, the first concave plates are welded to the upper and lower ends of the steel inner cylinder correspondingly, and the first steel cylinders are welded to the first concave plates; and the first concave plates enfold the first steel cylinders, the first convex plates are welded to the left and right sides of the first steel cylinders correspondingly, and the first convex plates are welded and mounted on the inner side wall of the steel outer barrel. The box column for the ship has the advantage of high structural strength.