A set of high-power and wide-speed-range test platform for electric vehicle power system is developed by using modular design method. It can perform single component and system testing for different types of electric vehicle drive motors, controllers, and powertrains. It can adapt to the CAN configuration of different communication protocols, and can carry out custom road tests (including electric inertia simulation). The overall design principle of the test platform, the design of the measurement and control system of the test platform, and the analysis of the test results are given detailedly. The results show that the test platform can meet the test requirements of different types of motors and controllers with wide speed range.