The cathode passivation induced by the accumulated solid products is a serious issue which impede the application of Li–O2 batteries. Here, we applied Ga–In liquid metal (Ga–In LM) functionalized cathode to alleviate the cathode passivation by using the fluidity and self-healing surface of Ga–In LM microdrops, which could hardly be covered by the solid discharge products, such as Li2O2 and LiOH during charge/discharge cycles. The modification with Ga– In LM microdrops brought with significant improvement on battery performance, where the cycle life of Li–O2 cells was extended from 55 rounds with pristine multiwalled carbon nanotubes (MWNTs) cathode to 310 rounds, and the full-discharge capacity was also enlarged from 0.4 mAh (4000 mAhg-1 MWNTs) to 3.42 mAh (8550 mAh g-1 MWNT/LM). The cathode passivation was apparently alleviated due to the functionalization, and the corrosion of Li anode was also relieved. This investigation implies that applying the cathode with fluidity may have the potential for solving the cathode passivation issues.