Engine testing device

The utility model relates to an engine testing device. The engine test device comprises a valve assembly, the valve assembly comprises a valve body and a throttle plate, the valve body is provided with a first opening, a second opening and a valve cavity, the first opening and the second opening are respectively communicated with the valve cavity, the throttle plate is rotatably arranged in the valve cavity, and the throttle plate is rotatably arranged in the valve cavity. The throttling plate can rotate in the valve cavity so as to adjust the opening degree. The first exhaust pipe is communicated with the first opening; one end of the second exhaust pipe is communicated with the second opening, and the other end of the second exhaust pipe is used for being communicated with an engine. The exhaust back pressure of different exhaust pipes can be simulated through the first exhaust pipe, cooperation of multiple persons is not needed, the exhaust pipes do not need to be replaced, the working efficiency and opera