Facile synthesis of ultrahigh-surface-area porous carbons while maintaining well-defined functionalities such as N-doping remains a formidable challenge because extensive creation of pores undoubtedly results in the huge damage of active sites. Herein, we have fabricated ultrahigh-surface-area N-doped hierarchically porous carbons via a multicomponent co-assembly approach. The resultant N-doped hierarchically porous carbons (N-HPC) possess ultrahigh surface area (~ 1960 m2/g), uniform interpenetrating micropore (~ 1.3 nm) and large size of mesopore (~ 7.6 nm), and heavy N-doping in the carbon frameworks (about 5 wt%). We show that the N-HPC exhibits a high specific capacitance (358 F/g at 0.5 A/g) as a supercapacitor electrode in alkaline aqueous electrolyte, with stable cycling performance of 10000 times charge/discharge reused. Moreover, CO2 high pressure absorbent of the N-HPC delivers an adsorption capacity of 29.0 mmol/g at 0 °C under a high pressure of 30 bar.