The　combination　of　in-situ　electrochemical　surface-enhanced　Raman　spectroscopy　(EC-SERS)　and　high-frequency　heating　technology　was　used　to　investigate　formic　acid　(HCOOH)　electrooxidation　at　variable　temperatures.　Any　preset　temperature　could　be　adjusted　within　1　s　on　the　surface　of　the　working　electrode　(thermocouple　microelectrode,　TCME)　by　using　the　high-frequency　heating　technology.　Cyclic　voltammetry　and　EC-SERS　were　used　to　investigate　the　electrooxidation　behavior　of　HCOOH　on　the　surface　of　Au@Pt　nanoparticles.　Cyclic　voltammetry　showed　that　elevated　temperatures　improve　the　catalytic　activity　of　Au@Pt/TCME　toward　HCOOH　oxidation.　The　EC-SERS　results　showed　that　the　intensity　of　the　Pt–C　band　decreased　with　an　increase　in　temperature,　which　indicates　that　a　high　temperature　favors　the　oxidative　desorption　of　CO　from　the　Pt　surface　and　improves　the　catalytic　reaction.　This　work　could　be　used　to　screen　catalysts　for　HCOOH　electrooxidation　at　high　temperature,　or　for　other　investigations　of　EC-SERS　at　variable　temperatures.　©　2018　Elsevier　Ltd