The　commercial　viability　of　lithium-sulfur　batteries　is　still　challenged　by　the　notorious　lithium　polysulfides　(LiPSs)　shuttle　effect　on　the　sulfur　cathode　and　uncontrollable　Li　dendrites　growth　on　the　Li　anode.　Herein,　a　bi-service　host　with　Co-Fe　binary-metal　selenide　quantum　dots　embedded　in　three-dimensional　inverse　opal　structured　nitrogen-doped　carbon　skeleton　(3DIO　FCSe-QDs@NC)　is　elaborately　designed　for　both　sulfur　cathode　and　Li　metal　anode.　The　highly　dispersed　FCSe-QDs　with　superb　adsorptive-catalytic　properties　can　effectively　immobilize　the　soluble　LiPSs　and　improve　diffusion-conversion　kinetics　to　mitigate　the　polysulfide-shutting　behaviors.　Simultaneously,　the　3D-ordered　porous　networks　integrated　with　abundant　lithophilic　sites　can　accomplish　uniform　Li　deposition　and　homogeneous　Li-ion　flux　for　suppressing　the　growth　of　dendrites.　Taking　advantage　of　these　merits,　the　assembled　Li-S　full　batteries　with　3DIO　FCSe-QDs@NC　host　exhibit　excellent　rate　performance　and　stable　cycling　ability　(a　low　decay　rate　of　0.014%　over　2,000　cycles　at　2C).　Remarkably,　a　promising　areal　capacity　of　8.41　mAh　cm(-2)　can　be　achieved　at　the　sulfur　loading　up　to　8.50　mg　cm(-2)　with　an　ultra-low　electrolyte/sulfur　ratio　of　4.1　mu　L　mg(-1).　This　work　paves　the　bi-serve　host　design　from　systematic　experimental　and　theoretical　analysis,　which　provides　a　viable　avenue　to　solve　the　challenges　of　both　sulfur　and　Li　electrodes　for　practical　Li-S　full　batteries.