To　adapt　to　multi-directional　excitation　input　from　vibration　environment,　a　multi-directional　vibration　energy　harvester　is　proposed　based　on　spiral　piezoelectric　cantilever　beams.　The　harvester　is　a　bidirectional　coupling　vibration　energy　harvester　composed　of　four-spiral　piezoelectric　beams,　which　are　made　by　pasting　polyvinylidene　fluoride(PVDF)on　a　red　copper　basal　layer.　The　vibration　characteristics　and　energy　harvesting　performance　of　the　single-　and　four-spiral　piezoelectric　beam　structures　are　analyzed　with　the　finite　element　simulation　and　experiments.　The　effects　of　shape　parameters　and　lumped　mass　of　the　spiral　structure　on　its　natural　frequency　and　load　resistance　on　its　output　power　are　studied.　Moreover,　the　open-circuit　output　voltage　and　power　under　different　loads　are　explored.　The　results　show　that　the　radius,　radial　pitch,　weight　and　thickness　have　great　effects　on　the　natural　frequency　of　the　single-spiral　piezoelectric　beam.　By　adding　5　g　and　10　g　lumped　masses,　the　first　natural　frequency　changes　from　29　Hz　to　22　Hz　and　18　Hz　respectively　compared　with　that　of　the　non-lumped　mass.　The　best　external　resistance,　the　peak　voltage　and　the　power　are　1×107　Ω,　12　V　and　7　μW,　respectively.　For　the　multi-directional　vibration　energy　harvester　having　four-spiral　piezoelectric　beams,　the　results　show　that　the　output　voltage　is　up　to　17　V　when　the　amplitude　of　the　exciter　is　5　m/　s2,　which　has　a　good　multi-directional　energy　harvesting　performance　from　low-frequency　vibration.　©　2024　Guojia　Jiaowei　Quanguo　Gaoxiao　Chuangan　Jishu　Yanjiuhui.　All　rights　reserved.