The invention discloses a function test system for controller used in hybrid electric or electric vehicle. Wherein, a central control computer controls the digital test instruments and program controlled equipments, communicates with the signal processing circuit and the controller, processes the input/output signal of he controller, and controls and displays the various signals; a signal processing circuit simulates the whole vehicle signal input into the controller and sends to the controller, processes the output signal from the controller and sends to the digital testing instrument for after-test display; and, the battery management system sends the monitored high voltage battery state to the central control computer by CAN communication for displaying on a software panel. The test system can perform automatic test to all the function parameters or some function parameter of the controller, and output corresponding test report; also can perform hand-operated test in detail to all the function parameters; has excellent versatility and scalability.