Pendulum using a piezoelectric harvesting system comprising: the piezoelectric element according to an embodiment of the present invention; And a piezoelectric element is mounted on at least one side, one end of which the other end is fixed is formed in a free end the magnet is mounted on the other end region engaging plate element; And the magnet and the magnetically warpage unit by interacting with the warp caused to the device coupling plate by applying vibration to the piezoelectric element a piezoelectric element to generate electrical energy; includes, deflection generating portion may be provided with a pendulum type. According to an embodiment of the invention, the piezoelectric element is if for example the mobile means of transportation, such as the piezoelectric harvesting vehicle in which the system is mounted by being attached to the device coupling plate of a cantilever type is a vibration or an inertial force generated to generate electrical energy that is, of course, it is possible to increase the vibration of the piezoelectric element by the coupling device and the plate portion warpage mutual magnetic action can increase the electrical energy generation.