Biomass shows great potential in synthesizing carbon materials for energy applications because of its renewability and low price. Rationally designing porous carbons with proper morphology and compo-sition are beneficial to promoting its application in energy storage devices. Here, an environmentally friendly approach is proposed to prepare three-dimensional (3D) N, P co-doped hierarchical porous carbon (NP-HPC) for supercapacitors. The 3D cross-linked porous network not only promotes the infil-tration of electrolytes, but also boosts the transportation of ion/electron. The high microporosity com-bined with heterogeneous doping provides more defects and active sites, improving the surface charge storage. Hence, the NP-HPC electrode achieves a high capacitance of 358 F g(-1) at 0.05 A g(-1) as well as good rate performance of 238 F g(-1) at 50 A g(-1). Moreover, NP-HPC-based all-solid-state supercapacitor exhibits a long lifespan over 10,000 cycles. The impressive performance of NP-HPC indicates the potential of biomass-derived porous carbons for supercapacitors through simultaneous morphology and doping engineering. (C) 2021 Elsevier Ltd. All rights reserved.