Biomass-derived porous carbon materials with excellent electrolyte wettability show promise as electrodes for commercial supercapacitors (SCs), but traditional synthesis methods lead to serious pollution and energy consumption. Here we propose an innovative, closed and scalable process for the production of B / N / O tridoped superhydrophilic carbon from biomass. The boric acid taken over serves as a recyclable and inducing agent due to the reversible conversion between boric acid and boron oxide and further completes the closed path for the production of superhydrophilic carbon obtained from biomass. The as-manufactured materials have a two-dimensional (2D) sheet-like structure and abundant pores; also the B, N and O heteroatoms, the on site introduced into the carbon skeleton improve the surface hydrophilicity of the carbon produced. Based on the synergistic effects of the hierarchical porous morphology, the superhydrophilicity and the properties of the multi-doping surface chemistry of the resulting materials, the penetration, the transport and the interaction of electrolyte ions within the carbon electrodes produced in this way would be greatly improved. This achieves a favorable electrochemical performance of the supercapacitor, which has a specific capacitance of up to 296 F g. can deliver-1@ 0.5 A g-1 in an aqueous electrolyte. This synthesis strategy, with ease of use and mild conditions, will be an efficient and potential way to achieve the widespread use of superhydrophilic carbon from biomass in supercapacitors.