Ballast tank structure convenient to overhaul

The utility model provides a ballast tank structure convenient to overhaul, and belongs to the technical field of ships. The cabin structure comprises an outer plate, an inclined plate and an inner bottom plate, rib plates which are perpendicular to the outer plate and are evenly distributed are arranged on the outer plate, and the cabin structure is characterized in that a maintenance platform which is horizontally arranged in the length direction of a ship body is arranged on the broadside of the outer plate and penetrates through the rib plates; a through hole is formed in the rib plate above the maintenance platform; and ladders connected to the bottom outer plate are arranged at the two ends of the maintenance platform. According to the utility model, a worker can conveniently overhaul the joint of the outer plate and the inclined plate of the ballast tank, the safety of the maintainer is improved, the construction workload of fitting-out can be reduced, the quality of an empty ship is reduced, and the c