For new energy vehicles, the high energy consumption is growing, how to determine the vibration of each parts of a car and perform a reasonable choice for cooperating the piezoelectric energy recovery device to reclaim vibration energy has become a hot research topic. By using the strong dynamics analysis software and the white noise input, the random vehicle road simulation analysis was carried out. When the vehicle is running at the H level of international standard road, the car left front suspension under the vibration of the cantilever is strong, the maxium amplitude is up to 3.5 mm. The classical finite element analysis of the piezoelectric cantilever shows that when the input displacement is 3 mm of load at the free end, the piezoelectric plate can produce 3 V voltage. By reasonable design of the combination of the piezoelectric cantilever and the cantilever of the left front of the vehicle, the vibration recovery of electric energy is enough for the car small power low power supply.