The invention discloses a pre-charging source circuit of a ship direct current networking, which is suitable for pre-charging of a ship power system and has higher redundancy and safety. The pre-charging source circuit comprises an emergency switchboard pre-charging source circuit, generator exciting winding pre-charging source circuits and a main control module. The number of the generator exciting winding pre-charging source circuits is the same as that of the asynchronous generators in a ship power generation module. The invention also discloses a pre-charging source system of the ship direct current networking based on the pre-charging source circuit and a control method of the pre-charging source circuit and the pre-charging source system.