In　this　study,　a　simple　and　high-performance　piezoelectric　energy　harvesting　devices　(PEHD)　based　on　composite　granular　chain　of　spheres　(CGCS)　is　investigated.　The　CGCS　is　constructed　by　inserting　a　light　granular　chain　into　the　middle　of　a　heavy　granular　chain.　When　an　impact　imposed　to　the　CGCS,　the　energy　of　the　impact　will　be　carried　by　solitary　wave　propagating　in　the　chain.　The　existence　of　the　heavy-light　interface　and　light-heavy　interface　makes　the　middle　section　of　chain　a　container　to　trap　the　energy　of　the　solitary　wave.　Therefore,　the　solitary　wave　will　reflect　back　and　forth　in　the　container　and　experience　slow　energy　attenuation.　Piezoelectric　wafer　is　embedded　into　one　of　the　spheres　of　the　container　to　act　as　a　PEHD.　Theoretical　model　of　the　proposed　PEHD　is　given　to　explain　the　energy　conversion　process　from　external　impact　to　the　output　voltage　of　the　piezoelectric　wafer.　The　bridge　between　the　solitary　wave-induced　stress　and　the　electric　field　is　highlighted.　Experiments　are　performed　in　CGCS　to　observe　the　solitary　wave-induced　voltage　of　the　piezoelectric　wafer　and　the　measured　waveform　agree　the　theoretically　prediction　results.　Finally,　the　effects　of　the　differences　in　material　properties　of　between　the　light　and　heavy　spheres　and　the　segment　number　of　composite　chain　on　the　collected　energy　are　investigated　for　improving　the　efficiency　of　capture　energy.　It　is　suggested　that　increasing　the　numbers　of　composite　segments　and　enlarging　the　differences　between　the　light　and　heavy　sphere　is　helpful　to　improve　the　performance　of　CGCS-based　PEHD.　Copyright　©　2019　ASME.