Critical　drawbacks,　including　sluggish　redox　kinetics　and　undesirable　shuttling　of　polysulfides　(Li2Sn,　n　=　4-8),　seriously　deteriorate　the　electrochemical　performance　of　high-energy-density　lithium-sulfur　(Li-S)　batteries.　Herein,　these　challenges　are　addressed　by　constructing　an　integrated　catalyst　with　dual　active　sites,　where　single-atom　(SA)-Fe　and　polar　Fe2N　are　co-embedded　in　nitrogen-doped　graphene　(SA-Fe/Fe2N@NG).　The　SA-Fe,　with　plane-symmetric　Fe-4N　coordination,　and　Fe2N,　with　triangular　pyramidal　Fe-3N　coordination,　in　this　well-designed　configuration　exhibit　synergistic　adsorption　of　polysulfides　and　catalytic　selectivity　for　Li2Sn　lithiation　and　Li2S　delithiation,　respectively.　These　characteristics　endow　the　SA-Fe/Fe2N@NG-modified　separator　with　an　optimal　polysulfides　confinement-catalysis　ability,　thus　accelerating　the　bidirectional　liquid-solid　conversion　(Li2Sn　＜-＞　Li2S)　and　suppressing　the　shuttle　effect.　Consequently,　a　Li-S　battery　based　on　the　SA-Fe/Fe2N@NG　separator　achieves　a　high　capacity　retention　of　84.1%　over　500　cycles　at　1　C　(pure　S　cathode,　S　content:　70　wt%)　and　a　high　areal　capacity　of　5.02　mAh　cm(-2)　at　0.1　C　(SA-Fe/Fe2N@NG-supported　S　cathode,　S　loading　=　5　mg　cm(-2)).　It　is　expected　that　the　outcomes　of　the　present　study　will　facilitate　the　design　of　high-efficiency　catalysts　for　long-lasting　Li-S　batteries.