A novel structrue of electromagnetic mechanical energy harvesting device attached to the piston head of the damper is designed and fabricated to harvest the kinetic energy of the magnetorheological fluid（MRF）flow within the MRF damper.The ultracapacitor are used as reservoirs.The corresponding low power energy management circuit is designed to supply energy for temperature sensors and wireless sensor module to obtain the internal state parameters of damper.The performance test experiment demonstrates that the energy harvesting device is able to deliver power（dozens of mW）at the peak open-circuit voltage up to 4.5V

and the harvested power can guarantee the normal operation of wireless sensor.