Electromagnetic induction heating (EMIH) boosted highly selective reduction of CO2 into CO on Fe fiber-based catalysts, via reverse water–gas shift (RWGS) proceeding at milder condition than traditional heating. Doping Ru promoted catalytic performance, and among them the optimal content of nominal Ru loading was 3 %. In system of EMIH-driven RWGS on 3 %Ru/Fe, the demanded temperature of reaction bed for about 40 % CO2 conversion decreased by 100 °C compared to traditional heating-driven RWGS. By employing in-situ characterizations configured with EMIH module, it was found that the alternating electromagnetic field deflected EMIH-induced current eddy causing electron enrichment on surface of catalyst. On the electron-rich surface of catalyst, RWGS reaction driven by EMIH obeyed HCOOH-intermediated mechanism, which faced lower energy barriers than the redox pathway underwent by traditional heating driven-RWGS.