The article discusses the challenges associated with the hydrogenation of solid aromatics, particularly aromatic rings, due to their high aromaticity and large reaction energy barriers. It highlights the necessity for ambient hydrogenation for certain hydrogen-related applications to mitigate explosion risks. The article introduces PdPtRuCuNi high-entropy alloy (HEA) nanocatalysts supported on HNO3-modified carbon nanofibers as a solution for the complete hydrogenation of C-C unsaturated bonds in solid aromatics. These catalysts enable the conversion of alkynyl and phenyl groups in benzene derivatives at room temperature and low hydrogen pressure, without the need for solvents or promoters. The synergy of Pd, Pt, Ru, Cu, and Ni in the HEA catalyst design allows for efficient hydrogenation of aromatic compounds. The synthesis and characterization of the HEA nanocatalysts demonstrate their uniform distribution on carbon nanofibers and nanocrystalline structure, supporting their high activity in hydrogenation reactions. Overall, the study provides a novel catalyst design guideline for effective, cost-efficient, and safe hydrogenation of aromatic compounds, offering a promising solution to the challenges posed by the hydrogenation of aromatics.