Oil supply system and control method thereof

The invention relates to an oil supply system and a control method thereof.The oil supply system is connected to an engine to supply oil to the engine, and the oil supply system comprises a main oil tank used for being connected with the engine; the auxiliary oil tank is connected with the main oil tank through a pipeline; the gas supply module is connected to the auxiliary oil tank through a pipeline; the control unit is in communication connection with the gas supply module; the air supply module supplies air to the auxiliary oil tank under the control of the control unit so as to change the air pressure in the auxiliary oil tank, and fuel oil in the auxiliary oil tank can enter the main oil tank under the action of the air pressure. According to the oil supply system, the main oil tank is connected to the engine, the main oil tank and the auxiliary oil tank are connected in series through the pipeline, and by arranging the air supply module and the control unit, when the fuel oil liquid level in the main o