Nickel-cobalt　layered　double　hydroxide　(NiCo-LDH)　has　received　much　attention　in　the　field　of　supercapacitor　electrodes　due　to　its　multiple　oxidation　states　and　good　electrochemical　activity.　However,　NiCo-LDH　often　suffers　from　structural　instability　and　low　conductivity　in　practical　applications.　In　this　study,　sea　urchin-like　structural　NiCo-LDH　coated　cobalt-nitrogen　co-doped　carbon　(NiCo-LDH@Co-NC-x)　electrode　materials　were　prepared　by　in　situ　growth　of　NiCo-LDH　on　the　surface　of　cobalt-nitrogen　co-doped　carbon　nanosheets　(Co-NC)　using　a　one-step　hydrothermal　method.　The　results　show　that　the　NiCo-LDH@Co-NC-2　electrode　material　exhibits　excellent　electrochemical　performance,　its　specific　capacitance　is　up　to　1909　F　g-　1　at　a　current　density　of　1　A　g-　1,　and　capacitance　retention　of　69.5　%　(only　26.2　%　for　NiCo-LDH)　can　be　achieved　after　10,000　cycles　at　a　current　density　of　10　A　g-　1.　This　is　because　the　abundant　and　uniformly　distributed　Co　nanoparticles　on　Co-NC　provide　nucleation　sites　for　the　in-situ　growth　of　NiCo-LDH,　effectively　improving　the　interface　binding　between　Co-NC　and　NiCo-LDH,　enhancing　the　structural　stability　of　NiCo-LDH,　and　ensuring　highly　efficient　electron　transport　throughout　the　NiCo-LDH@Co-NC-2　electrode.　An　asymmetric　supercapacitor　(NiCo-LDH@Co-NC-2//　AC)　was　further　assembled　with　NiCo-LDH@Co-NC-2　and　activated　carbon　(AC)　as　positive　and　negative　electrodes,　respectively,　achieving　an　energy　density　as　high　as　36.8　Wh　kg-　1　at　a　power　density　of　750　W　kg-　1.　These　findings　suggest　that　the　NiCo-LDH@Co-NC-2　composite　can　be　a　promising　candidate　for　highperformance　supercapacitor　electrode.