High-frequency　responsive　electrochemical　capacitor　(EC),　as　an　ideal　lightweight　filtering　capacitor,　can　directly　convert　alternating　current　(AC)　to　direct　current　(DC).　However,　current　electrodes　are　stuck　in　limited　electrode　area　and　tortuous　ion　transport.　Herein,　strictly　vertical　graphene　arrays　(SVGAs)　prepared　by　electric-field-assisted　plasma　enhanced　chemical　vapour　deposition　have　been　successfully　designed　as　the　main　electrode　to　ensure　ions　rapidly　adsorb/desorb　in　richly　available　graphene　surface.　SVGAs　exhibit　an　outstanding　specific　areal　capacitance　of　1.72　mF　cm−2　at　Φ120=80.6°　even　after　500　000　cycles,　which　is　far　better　than　that　of　most　carbon-related　materials.　Impressively,　the　output　voltage　could　also　be　improved　to　2.5　V　when　using　organic　electrolyte.　An　ultra-high　energy　density　of　0.33　μWh　cm−2　can　also　be　handily　achieved.　Moreover,　ECs-SVGAs　can　well　smooth　arbitrary　AC　waveforms　into　DC　signals,　exhibiting　excellent　filtering　performance.　©　2021　Wiley-VCH　GmbH