Flexible　supercapacitors　have　shown　enormous　potential　for　portable　electronic　devices.　Herein,　hierarchical　3D　all-carbon　electrode　materials　are　prepared　by　assembling　N-doped　graphene　quantum　dots　(N-GQDs)　on　carbonized　MOF　materials　(cZIF-8)　interweaved　with　carbon　nanotubes　(CNTs)　for　flexible　all-solid-state　supercapacitors.　In　this　ternary　electrode,　cZIF-8　provides　a　large　accessible　surface　area,　CNTs　act　as　the　electrical　conductive　network,　and　N-GQDs　serve　as　highly　pseudocapactive　materials.　Due　to　the　synergistic　effect　and　hierarchical　assembly　of　these　components,　N-GQD@cZIF-8/CNT　electrodes　exhibit　a　high　specific　capacitance　of　540　F　g(-1)　at　0.5　A　g(-1)　in　a　1　m　H2SO4　electrolyte　and　excellent　cycle　stability　with　90.9%　capacity　retention　over　8000　cycles.　The　assembled　supercapacitor　possesses　an　energy　density　of　18.75　Wh　kg(-1)　with　a　power　density　of　108.7　W　kg(-1).　Meanwhile,　three　supercapacitors　connected　in　series　can　power　light-emitting　diodes　for　20　min.　All-solid-state　N-GQD@cZIF-8/CNT　flexible　supercapacitor　exhibits　an　energy　density　of　14　Wh　kg(-1)　with　a　power　density　of　89.3　W　kg(-1),　while　the　capacitance　retention　after　5000　cycles　reaches　82%.　This　work　provides　an　effective　way　to　construct　novel　electrode　materials　with　high　energy　storage　density　as　well　as　good　cycling　performance　and　power　density　for　high-performance　energy　storage　devices　via　the　rational　design.