In　this　paper,　an　active　control　strategy　is　employed　to　actively　tune　the　vibration　and　wave　propagation　properties　in　a　piezoelectric　metamaterial　beam.　The　piezoelectric　actuator　and　sensor　are　periodically　arranged　along　the　piezoelectric　metamaterial　beam.　By　using　the　extended　Hamilton　principle,　the　governing　equations　for　the　fully　coupled　piezoelectric　metamaterial　beam　are　obtained.　The　negative　proportional　feedback　control　strategy　is　introduced　to　achieve　the　periodical　active　stiffness　for　the　piezoelectric　metamaterial　beam.　The　band　structures　and　natural　frequencies　of　the　proposed　periodic　structure　are　derived　by　the　transfer　matrix　method,　and　the　spectral　element　method　is　applied　as　numerical　validation.　The　influences　of　the　feedback　control　gain　ratio,　length　ratio,　and　the　number　of　the　unit　cells　on　natural　frequencies　and　bandgaps　are　discussed.　Results　indicate　that　the　natural　frequencies　of　the　system　are　reduced　with　the　increase　in　the　feedback　control　gain　ratio　and　length　ratio.　In　addition,　multiple　bandgaps　can　be　generated　by　using　the　negative　proportional　feedback　control　strategy.　It　is　found　that　bandwidths　can　be　obviously　broadened　by　selecting　the　proper　feedback　control　gain　ratio　and　length　ratio.　The　theoretical　and　numerical　results　show　that　the　vibration　and　wave　propagation　properties　of　the　proposed　piezoelectric　metamaterial　beam　can　be　controlled　by　using　the　negative　proportional　feedback　control　strategy.