Graphene　hydrogel　(GH)　has　been　widely　explored　as　electrode　material　for　supercapacitors　due　to　its　threedimensional　porous　network　structure.　However,　poor　conductivity　and　low　capacitance　activity　have　limited　practical　application.　Herein,　we　design　and　fabricate　a　hierarchical　all-carbon　GH-based　electrode　material　decorated　with　MOF-derived　porous　carbon　(cZIF-8)　and　highly　N-doped　graphene　quantum　dots.　In　this　N-GQD@cZIF-8/GHcomposite,　GH　constructs　an　interconnected　porous　structure　which　benefits　rapid　electron/ion　transport,　and　cZIF-8　provides　a　large　specific　surface　area　and　enhances　electrical　conductivity,　while　N-GQDs　contribute　pseudo-capacitance　and　improve　the　wettability.　The　supercapacitor　based　on　N-GQD@cZIF-8/GH　shows　a　high　areal　capacitance　(617.1　mF　cm(-2))　and　areal　energy　density　(85.7　mu　Wh　cm(-2))　at　1　mA　cm(-2).　It　also　has　good　rate　capability　(81.5%　at　20　mA　cm(-2))　and　excellent　cycling　stability　(93.1%　after　10,000　cycles).　Moreover,　the　assembled　all-solid-state　flexible　supercapacitor　can　deliver　a　high　energy　density　of　18.1　mWh　cm(-3)　at　high　power　density　of　4907.3　mW　cm(-3).　This　rational-designed　all-carbon　electrode　opens　up　opportunities　in　the　fabrication　of　next-generation　wearable　electronic　equipments.