The invention relates to an extracorporeal circulation tank of an artificial liver supporting system, which consists of a circulatory part and a control part. The circulatory part is provided with a tank body, an inlet, a hollow fiber pipe, an outlet, a three-way pipe, an outlet of the circulation tank, and a feedback inlet; and the control part is provided with the tank body, an oxygen inlet, an opening, a warming device, a fan, a control pipeline, a display screen and a plastic tube. The hollow fiber pipe is embedded on the inner wall of the tank body, the inlet and the outlet are arranged corresponding to two ends of the hollow fiber pipe, one end of the three-way pipe is connected with an outlet and the other two ends are connected with a peristaltic pump and the outlet of the circulation tank respectively, the upper part of the tank body is provided with the oxygen inlet and the lower part is provided with the opening, and the display screen is arranged on the upper part of the tank body and is connected with the control pipeline. Compared with the prior extracorporeal circulation device, the extracorporeal circulation tank has the function of monitoring temperature, pump speed and blood oxygen content in real time, can realize recirculation for the blood plasma in a reactor, guides the substance exchange between hepatocyte and severe liver blood plasma to be more complete, and improves the efficiency of an artificial liver device. The extracorporeal circulation tank has the advantages of reasonable design, convenient operation and practicality.