In this study, a simple hydrothermal approach is employed for the rational manufacturing of MoS2 nanoflowers (MoS2-NFs) grafted onto highly porous functionalized woody pulp-derived biochar (f-WPB) for use in supercapacitors (SCs). Investigations are conducted into the produced materials’ morphological, textural, physicochemical surface, and electrochemical performance. The MoS2-NFs are uniformly grown on the f-WPB and subsequently lead to an increase in the developed MoS2-NFs/f-WPB nanocomposite’s specific capacity/capacitance if compared to the individual MoS2-NFs and f-WPB, reaching 285 C g-1 (610 F g-1) at 1 A g-1. These findings suggest that the produced composite (MoS2-NFs/f-WPB) has the potential to be an efficacious SC electrode material. Surprisingly, the constructed device achieved a remarkable specific energy of 12 Wh kg-1 at a specific power of 1075 W kg-1. MoS2-NFs/f-WPB nanocomposite is prospective for use in SC applications, as can be revealed by the assembled device’s cycling stability performance, which preserved 82 % after 2000 cycles of its initial capacity.