The invention discloses a rack for a hull cleaning monitoring underwater robot. The rack for the hull cleaning monitoring underwater robot comprises an outer wall surrounding the rack by one circle. A plurality of transverse reinforcing ribs are arranged in the outer wall, and the two ends of each transverse reinforcing rib are both fixed to the inner side of the outer wall. A plurality of longitudinal reinforcing ribs are arranged on the multiple transverse reinforcing ribs. The transverse reinforcing ribs comprise the first transverse reinforcing rib, the second transverse reinforcing rib, the third transverse reinforcing rib and the fourth transverse reinforcing rib. The longitudinal reinforcing ribs comprise the first longitudinal reinforcing rib and the second longitudinal reinforcing rib. Gaps between the multiple transverse reinforcing ribs and the multiple longitudinal reinforcing ribs are filled with waterproof plates. The rack for the hull cleaning monitoring underwater robot has the following advantages of being high in structural strength, durable and capable of effectively resisting deepwater pressure.