Oil supply device capable of freely switching oil supply modes

The utility model relates to an oil supply device capable of freely switching oil supply modes. The oil supply device comprises an oil tank and a rotating hook portion, wherein the oil tank and the rotating hook portion are connected through an oil line pipe. The oil supply device is characterized in that the rotating hook portion is connected with an oil filter, an oil outlet of the oil filter is provided with a pressure pump, the pressure pump is connected with a valve, and the valve is connected with the oil tank through the oil line pipe. According to the oil supply device, cyclic utilization and cleaning of engine oil can be achieved through the oil filter, and the oil supply device prevents the engine oil from contaminating clothes of operators, saves work hours and reduces cost.