In　this　work,　MgCo2O4　nanowires@MnO2　nanoflakes　core-shell　arrays　structure　on　graphene-decorated　nickel　foam　were　successfully　prepared,　which　were　featured　by　porous　MnO2　nanoflakes　shell　and　one-dimensional　MgCo2O4　nanowires　core　directly　grown　on　the　graphene.　The　morphologies　of　MgCo2O4　nanowires@MnO2　nanoflakes　core-shell　arrays　can　be　tuned　by　changing　the　hydrothermal　reaction　times.　Due　to　the　synergistic　effect　of　graphene,　MgCo2O4　nanowires,　and　MnO2　nanoflakes,　the　optimized　MgCo2O4　nanowires@MnO2　nanoflakes　core-shell　arrays　electrode　materials　exhibited　excellent　electrochemical　performance　such　as　high　specific　capacitances　of　887.3　F　g(-1)　at　a　current　density　of　1　A　g(-1)　and　good　long-term　cycling　stability　over　3000　cycles　at　a　high　current　density　of　10　A　g(-1).　The　findings　reported　here　clearly　demonstrated　that　the　core-shell　arrays　structure　may　be　a　promising　candidate　of　high-performance　electrode　materials　for　supercapacitor.