Box-shaped cross beam structure of liquefied natural gas cabin of dual-fuel automobile roll-on-roll-off ship

The invention discloses a box-shaped cross beam structure of a liquefied natural gas cabin of a dual-fuel automobile roll-on-roll-off ship. The box-shaped cross beam structure comprises a liquefied natural gas cabin deck located above a liquefied natural gas fuel tank. Supporting columns are fixedly arranged on the upper surface of the liquefied natural gas cabin deck; a first supporting cross beam, a second supporting cross beam, a first longitudinal beam and a second longitudinal beam are fixedly arranged on the lower surface of the liquefied natural gas cabin deck; the vertical projection of the supporting column is located in a quadrilateral area defined by the first supporting cross beam, the second supporting cross beam, the first longitudinal beam and the second longitudinal beam. A panel is fixedly arranged at the bottom of the first supporting cross beam and fixedly connected to the bottoms of the second supporting cross beam, the first longitudinal beam and the second longitudinal beam at the same t