The invention discloses a hydraulic locked oil charging system of a hydraulic torque converter used for a loader. The hydraulic locked oil charging system of the hydraulic torque converter used for the loader comprises an oil fill pipeline, circulating pipelines and the hydraulic torque converter. An oil tank and a first gear pump are connected to the oil fill pipeline in sequence. A second gear pump, a heat exchanger and a control valve are connected to the circulating pipelines in sequence. An outlet of the heat exchanger communicates with an outlet of the first gear pump. The control valve is provided with an oil inlet connector, an oil outlet connector, a first oil-way connector and a second oil-way connector. The oil inlet connector communicates with the outlet of the first gear pump. The oil outlet connector is connected with an inlet of the second gear pump. The hydraulic torque converter is provided with a locking connector and an unlocking connector. The locking connector is connected with the first oil-way connector. The unlocking connector is connected with the second oil-way connector. The hydraulic locked oil charging system of the hydraulic torque converter used for the loader can reduce the power consumption of an oil pump in the system, take away heat generated in the operating process of the torque converter and prevent the cavitation phenomenon in the hydraulic torque converter and loss of complementary hydraulic oil.