Soft　carbon　(SC)　is　a　promising　anode　material　for　potassium-ion　hybrid　capacitors　(PIHCs),　but　there　are　limited　K+　storage　sites　in　common　SC　due　to　a　skin-like　carbon　film　covering　on　the　surface.　To　address　this　issue,　a　simple　oxidization　method　to　completely　remove　the　skin-like　carbon　film　is　reported　and　a　novel　accordion-like　architecture　of　SC　(ASC)　is　constructed　with　a　hierarchical　porous　framework　composed　of　micropores,　mesopores,　and　macropores,　all　of　which　can　be　exposed　to　K+　electrolytes　for　enhanced　energy　storage.　Importantly,　this　exposed　structure　facilitates　pseudocapacitance　modification　by　electro-deposition　of　highly　electrochemically　active　nitrogen-doped　graphene　quantum　dots　(N-GQDs)　to　enhance　kinetic　performance　and　additional　K+　storage.　After　annealing　treatment　to　regulate　N-doping　type,　the　accordion-like　N-GQD@ASC-500　exhibits　excellent　reversible　capacity　of　360　mAh　g(-1)　as　well　as　superior　rate　capability　and　cycle　stability.　Kinetic,　in　situ　Raman/electrochemical　impedance　spectroscopy　analysis,　and　density　functional　theory　calculation　elucidate　the　K+　storage　mechanism.　As　expected,　the　PIHC　assembled　with　N-GQD@ASC-500　anode　and　porous　carbon　cathode　delivers　an　ultrahigh　energy/power　density　(171　Wh　kg(-1)　and　20　000　W　kg(-1))　with　long　cycle　life.　This　work　suggests　that　ASC　is　a　promising　anode　material　for　designing　of　high-performance　PIHCs.