BAW-based　micromixers　usually　achieve　mixing　enhancement　with　acoustic-induced　bubbles,　while　SAW-based　micromixers　usually　enhance　mixing　efficiency　by　varying　the　configuration　of　IDTs　and　microchannels.　In　this　paper,　bubble-enhanced　acoustic　mixing　induced　by　standing　surface　acoustic　waves　(SSAWs)　in　a　microchannel　is　proposed　and　experimentally　demonstrated.　Significant　enhancement　in　the　mixing　efficiency　was　achieved　after　the　bubbles　were　stimulated　in　our　acoustofluidic　microdevice.　With　an　applied　voltage　of　5　V,　50　times　amplified,　the　proposed　mixing　microdevice　could　achieve　90.8%　mixing　efficiency　within　60　s　at　a　flow　rate　of　240　μL/h.　The　bubbles　were　generated　from　acoustic　cavitation　assisted　by　the　temperature　increase　resulting　from　the　viscous　absorption　of　acoustic　energy.　Our　results　also　suggest　that　a　temperature　increase　is　harmful　to　microfluidic　devices　and　temperature　monitoring.　Regulation　is　essential,　especially　in　chemical　and　biological　applications.　©　2022　by　the　authors.