Emergency control system of marine manned crane

The emergency control system comprises a main motor pump set and a standby motor pump set, the main motor pump set is powered by a conventional power source, the standby motor pump set is powered by an emergency power source, and the main motor pump set and the standby motor pump set share an oil tank; a main operating valve and an emergency operating valve are arranged in a crane tower, a standby motor pump set is led out of an oil tank through an independent oil outlet pipeline and then connected into an oil inlet of the emergency operating valve, the emergency operating valve outputs six working oil pipes in total, and the six working oil pipes are connected with three-way switching valves on oil inlets and oil outlets of a winch executing mechanism, a variable-amplitude executing mechanism and a rotary executing mechanism respectively. Each three-way switching valve is provided with three groups of oil ports, the first group of oil ports is connected with a working oil port of the executing mechanism, the