The　polymer　electrolyte　based　lithium-oxygen　battery　has　showed　higher　safety　than　that　of　organic　liquid　electrolyte.　However,　the　energy　efficiency　and　cycling　stability　are　still　the　challenges　for　the　practical　application　of　lithium-oxygen　battery.　Herein,　the　1,4　para　benzoquinone　has　been　demonstrated　as　dual-function　redox　mediator　for　promoting　both　oxygen　reduction　and　oxygen　evolution　reactions　of　lithium-oxygen　battery　with　polymer　electrolyte,　which　have　been　confirmed　by　the　Cyclic　Voltammetry　and　discharge/charge　test　of　battery　under　O-2　gas,　as　well　as　the　theoretical　calculations.　Furthermore,　the　composite　cathode　that　in-situ　constructed　by　polymerizing　electrolyte　precursors　with　redox　mediator　can　be　beneficial　for　the　electrochemical　reactions.　Combing　composite　cathode　and　lithium　ions　source,　the　polymer　electrolyte　based　lithium-oxygen　batteries　can　operate　for　long　lifetime　with　low　charge　potentials　and　good　rate　performances.　Thus,　this　work　has　highlighted　the　promising　implementation　of　lithium-oxygen　battery　based　on　polymer　electrolyte,　in　which　the　dual-function　redox　mediator　are　employed　for　both　discharge　and　recharge　processes.　(C)　2022　Published　by　Elsevier　Ltd　on　behalf　of　The　editorial　office　of　Journal　of　Materials　Science　&　Technology.