The invention relates to the technical field of deep sea survival equipment, in particular to a lower hatch lid lidding device used for a collectivity escaping compartment. A lower hatch of the escaping compartment body is provided with a surrounding wall, a lower hatch lid is pivoted to and connected to the outer wall of the surrounding wall, a fence inner ring is arranged at the butt joint portion of the surrounding wall and the lower hatch lid, a butt joint inner ring is arranged at the portion, corresponding to the fence inner ring, at the inner side of the lower hatch lid, the lidding device comprises a lifting component and a locking component, the lifting component lifts the lower hatch lid to the closing position, the locking component makes the butt joint inner ring on the lower hatch lid tightly attached to the fence inner ring at the inner side of the escaping hatch body, therefore quick closing of the collectivity escaping compartment and the lower hatch lid is achieved, and the lidding device is compact and reasonable in structure, high in reliability and convenient to operate, and can effectively improve the escaping efficiency of personnel.