A butterfly piezoelectric generator with multilayer cantilever beams is designed for improving the generating performance of piezoelectric generator.To investigate the generating performance of piezoelectric bimorph beam in the equipment,the output voltage theoretical model of piezoelectric cantilever beam with load on free end is established for analyzing the open circuit output voltage of piezoelectric bimorph beam.The experimental setup is put up and physical device is also fabricated to measure the output voltage.The present theoretical results of multilayer piezoelectric generator coincide well with the related experimental data; the error is less then 10%. After the six layers of piezoelectric generator are in series,the output power can be up to six times that of the single layer,while the output voltage remains the same.It indicates that the novel butterfly multilayer piezoelectric cantilever can significantly improve the generating capacity of piezoelectric generator.