In response to the problem of high power acceleration work battery load and low braking energy recovery efficiency of electric vehicles, the vehicle retrofitted with electromechanical flywheel system proposed by this paper makes the power and economy of the vehicle is improved. A suitable fuzzy control strategy was developed by studying the principles of power splitting and torque coupling of the planetary gear mechanism. Energy management strategies are developed based on improving the efficiency of system energy use. The whole vehicle model is built using CRUISE, and MATLAB-Simulink is used to design the fuzzy control strategy for energy management. CRUISE and MATLAB-Simulink are established as a joint simulation platform through Interface for simulation analysis. The results show that, first of all, the vehicles equipped with the electromechanical flywheel system precisely fulfill the driver's driving requirements. Second, the flywheel and control motor work in accordance with its operating principle. Finally, four-wheel drive vehicles equipped with an electromechanical flywheel system have a 10.26% reduction in NEDC operating electricity consumption compared to regular four-wheel drive vehicles.