The invention discloses a heart function sensor comprising a housing, a guide wire, conductive electrodes and high polymer piezoelectric material filling between the electrodes. The high polymer piezoelectric material is used for sensing human body surface vibration caused by heartbeat; the vibration is converted into corresponded electric signals output by the guide wire. The high polymer piezoelectric material has the advantages of high response speed, high sensitivity and high linearity, and the accuracy and precision of signal acquisition of the sensor are guaranteed; the signals representing the heartbeat function can be acquired according to the output electric signals through the corresponded processing circuit and can be used for heart function health analysis.