The　internal　electric　field　within　a　piezoelectric　material　can　effectively　inhibit　the　recombination　of　photogenerated　electron-hole　pairs,　thus　serving　as　a　means　to　enhance　photocatalytic　efficiency.　Herein,　we　synthesized　a　Na0.5Bi4.5Ti4O15　(NBT)　catalyst　by　the　hydrothermal　method　and　optimized　its　catalytic　performance　by　simple　high-voltage　poling.　When　applying　light　and　mechanical　stirring　on　a　2　kV　mm(-1)　poled　NBT　sample,　almost　100%　of　Rhodamine　B　solution　could　be　degraded　in　120　min,　and　the　reaction　rate　constant　reached　as　high　as　28.36　x　10(-3)　min(-1),　which　was　4.2　times　higher　than　that　of　the　unpoled　NBT　sample.　The　enhanced　piezo-photocatalytic　activity　is　attributed　to　the　poling-enhanced　internal　electric　field,　which　facilitates　the　efficient　separation　and　transfer　of　photogenerated　carriers.　Our　work　provides　a　new　option　and　idea　for　the　development　of　piezo-photocatalysts　for　environmental　remediation　and　pollutant　treatment.