The utility model relates to power unit test box which is an auxiliary device for SVG power unit tests. The power unit test box comprises a framework, a front door, a rear sealing plate and sealing plates on two sides, wherein the front door, the rear sealing plate and the sealing plates on two sides are disposed on the framework to form a box body structure. A fan is disposed at the top of the box body. Ventilation holes are disposed in the front door. Air outlets are disposed in the rear sealing plate. The inside of the box body are divided into a front cavity and a back cavity, wherein a power unit trolley is disposed in the front cavity and a connection copper bar is disposed in the back cavity. The advantages are that tests of power units can be conducted in the power unit test box, and thus experiment conditions are well improved, and work efficiency and test reliability are furthermore improved; and tests of power units of various types can be conducted in the test box.