We　present　a　novel　approach　for　hierarchical　fabrication　of　high-performance,　all-solid-state,　flexible　supercapacitors　from　environmentally　friendly　all-carbon　materials.　Three-dimensional　carbon　nanotube/carbon　cloth　network　(CNT/CC)　is　used　as　a　conductive,　flexible　and　free-standing　scaffold　for　the　electro-deposition　of　highly　N/O　co-doped　graphene　quantum　dots　to　form　the　high-activity,　all-carbon　electrodes.　The　hierarchical　structure　of　the　CNT/CC　network　with　high　electrical　conductivity　and　high　surface　area　provides　improved　conductive　pathways　for　the　efficient　activation　of　GQDs　with　high　pseudocapacitance　and　electrical　double　layer　capacitance.　The　obtained　N-O-GQD/CNT/CC　electrodes　for　all-solid-state　flexible　supercapacitors　exhibit　an　ultrahigh　areal　capacitance　of　up　to　461　mF　cm　(2)　at　a　current　density　of　0.5　mA　cm　(2),　while　keeping　high　rate　and　cyclic　performances.　This　work　highlights　the　great　potential　of　highly　active　GQDs　in　the　construction　of　high-performance　flexible　energy-storage　devices.(C)　2017　Elsevier　Ltd.　All　rights　reserved.