Nickel-cobalt　layered　double　hydroxides　(NiCo-LDHs)　are　highly　promising　materials　for　energy　storage　elec-trodes.　However,　the　poor　conductivity　and　easy　agglomeration　limit　their　practical　application.　Herein,　the　novel　hollow　nanocage　architecture　of　NiCo-LDH　nanosheets　(H-NiCo-LDH)　decorated　N-doped　graphene　quantum　dots　(N-GQDs)　is　constructed　using　zeolitic　imidazolate　framework-67　(ZIF-67)　as　self-sacrificed　tem-plate.　The　hollow　nanocage　structure　suppresses　the　agglomeration　of　nanosheets　and　enlarges　the　electro-chemical　interface,　while　the　decoration　of　N-GQDs　effectively　improves　electrical　conductivity　and　provides　more　abundant　active　sites.　More　importantly,　HRTEM　characterization　shows　the　construction　of　hetero-junctions　between　H-NiCo-LDH　and　N-GQDs,　and　the　interfacial　charge　redistribution　through　p-n　hetero-junction　promotes　interfacial　electron　transfer　and　enhances　redox　activity.　Consequently,　the　N-GQD/H-NiCo-LDH　electrode　delivers　a　high　specific　capacitance　of　2347　F　g-1　(326　mA　h　g-1)　at　1　A　g-1　with　excellent　rate　performance　(82%　capacitance　retention　at　10　A　g-1).　The　assembled　asymmetric　supercapacitor　by　N-GQD/H-NiCo-LDH　and　active　carbon　exhibits　an　energy　density　of　52.1　W　h　kg　-1　at　a　power　density　of　770　W　kg　-1　with　remarkable　cycling　stability　(80.5%　capacitance　retention　after　5000　cycles).　The　hollow　nanocage　structure　and　enhanced　electrical　conductivity　of　N-GQDs　make　the　N-GQD/H-NiCo-LDH　a　highly　promising　material　for　electrochemical　energy　storage　applications.