Supercapacitors are energy storage devices that have many applications from memory storage devices, vehicle power supplies, micro sensors and so on. Recently, the electrode material of supercapacitors have been manufactured from fossil fuels which have many concern for depletion therefore, there is urgent to find low cost, eco-friendly and advance carbon electrode materials. In this context, the development of nitrogen-doped porous activated carbons from biomass is of significance for electrode materials. Herein, we report a simple route to prepare phosphorons/nitrogen-doped porous carbon derived from pea protein via hydrothermal carbonization (HTC) and the post-annealing treatment. The surface, textural and morphological properties of synthesized materials were investigated by SEM, XPS, Raman, FTIR and surface area analyzer. A series of mesoporous carbon up to 7.6 N and 2.2 wt. % P along with high the BET surface were synthesized successfully. The obtained materials depicts graphitic carbon particles. Electrochemical properties of the prepared materials were analyzed by cyclic voltammetry (CV), charge-discharge (CD), electrochemical impedance spectroscopy (EIS), KOH and H₂SO₄ electrolyte solution. The PGC-700 shows outstanding capacitive performance (299 F g^-1 at 1 A g^-1) , good rate capacitive , and excellent cycling stability due to the synergistic effect of N, P-doped species. This work opens up a new way to prepare advance N/P-doped carbon materials with tailored properties.