Recessed cargo hold structure

The invention relates to the technical field of ships, and particularly discloses a concave cargo hold structure which comprises a ship body, a plurality of transverse bulkheads are arranged on the ship body at intervals in the ship direction, the transverse bulkheads divide the interior of the ship body into a plurality of independent cargo hold spaces, and a plurality of platforms are horizontally arranged in each independent cargo hold space. A main deck and a hatch coaming top plate are arranged at the top of the ship body, the hatch coaming top plate is arranged on the upper portion of the main deck, a concave groove position is formed in the end face of each transverse bulkhead towards the inner side of the transverse bulkhead, and the concave groove positions extend to the hatch coaming top plate from the uppermost layer platform in the longitudinal ship direction. And a concave straight ladder assembly is arranged in the concave groove position, and does not occupy the space of the cargo hold. Accordi