The invention discloses a cooling system for a forced induction engine test and a using method thereof. The cooling system for the forced induction engine test comprises a forced induction engine, an intercooler cooling box, an expansion tank, a collection box, a heat exchange unit, a controller, and a pump, wherein the intercooler cooling box is used for cooling an intercooler; the expansion tank is used for storing test water and discharging air in a test pipe; the collection box is used for recovering and storing the test water, replenishing water for the whole system and cooling high-temperature air; the heat exchange unit is used for cooling the test water in the pipe; the controller is used for cooling the running of the whole system; and the pump is used for driving the test water. The forced induction engine, the expansion tank and the heat exchange unit form a cooling circulation loop 1, and the intercooler cooling box, the collection box and the pump form a cooling circulation loop 2. Through the cooling system for the forced induction engine test, cooling liquid can be automatically filled and the intercooler can be effectively cooled in the forced induction engine test, a large amount of water resources are saved and test efficiency is improved.