Charge　recombination　severely　restricts　the　photocatalytic　efficiencies　of　materials.　Loading　cocatalysts　on　the　surface　of　host　photocatalysts　is　a　promising　strategy　for　charge　separation,　which,　however,　suffers　from　the　large　Schottky　barrier　at　the　cocatalyst/host　interface.　Herein,　a　series　of　Pt/PbTiO3　compounds　were　constructed　as　a　proof-of-concept　utilizing　the　piezoelectric　field　of　PbTiO3　under　acoustic　vibrations　to　modulate　the　height　of　the　interfacial　Schottky　barrier.　These　hybrid　systems　achieved　highly　efficient　piezo-photocatalytic　H2　evolution　under　simultaneous　ultrasonication　and　light　illumination.　The　manipulation　of　the　height　of　the　Schottky　barrier　by　the　piezoelectric　effect　was　validated　by　the　I-V　characteristics　collected　from　conductive　AFM.　It　is　proposed　that　the　acoustic-wave-induced　piezoelectric　field　increased　the　electron　flow　from　PbTiO3　to　Pt　over　the　modulated　Schottky　barrier,　which　promoted　the　spatial　separation　of　photo-generated　charge　carriers　and　consequently　enhanced　the　H2　evolution.　These　findings　will　extend　the　fundamental　understanding　of　the　synergistic　piezo-photocatalysis　mechanism　and　provide　a　new　opportunity　toward　the　rational　design　of　novel　materials　systems　for　clean　energy　conversion.　©　2023　The　Royal　Society　of　Chemistry.