A pillowshaped piezoelectric harvester was proposed in this paper. With the aim to know about the generating capacity of the piezoelectric harvester, the finite element simulation was performed.The simulation results showed that the output voltages of the piezoelectric harvester decreased with the increase of the thickness of the flexible substrate,the width of the piezoelectric cantilever and the initial curvature radius; the output voltages of the piezoelectric harvester increased with the increase of the length of the piezoelectric cantilever and the elastic modulus ratio;the output voltages of the piezoelectric harvester first increased and then decreased with the increase of thickness of the piezoelectric film.Furthermore, the output voltages of the inside piezoelectric film of the piezoelectric cantilever were larger than the outside piezoelectric film and the beryllium bronze substrate piezoelectric cantilever was superior to the steel substrate piezoelectric cantilever.