Abstract: An underwater network management system includes a manager corresponding to a management station, and a plurality of agents connected to the manager and corresponding to a gateway and a plurality of underwater devices, wherein each of the manager and the plurality of agents includes an underwater management information base including a plurality of managed objects for managing an underwater network and the plurality of underwater devices, and the manager controls operations for status monitoring and management of the underwater network and the plurality of underwater devices based on information included in managed objects provided from the plurality of agents.