For　improving　the　conductivity　of　porous　carbon　and　the　utilizations　of　its　pore　structures,　a　hierarchical　porous　carbon　(HPC)　had　been　developed　with　highly　fluffy　three-dimensional　(3D)　continuous　network　structure.　Using　the　HPC　as　a　support,　a　novel　MnO2@HPC　composite　with　3D　interpenetrating　network　structure　was　prepared　as　electrode　material　of　supercapacitor　via　simple　hydrothermal　method.　When　the　hydrothermal　reaction　temperature　was　100°C,　the　MnO2　nanofibers　(∼5　nm)　were　uniformly　grown　on　and　within　the　fluffy　3D　porous　network　of　the　HPC,　forming　a　composite　with　interpenetrating　network　structure.　The　as-prepared　composite　(MnO2@HPC-100)　exhibited　the　characteristics　of　both　electric　double-layer　capacitance　and　pseudo-capacitance,　which　had　a　high　specific　capacity　of　368　F　g−1　at　a　current　density　of　0.5　A　g−1　and　186　F　g−1　at　10　A　g−1　(50.5%　retention).　In　addition,　the　asymmetric　supercapacitor　device　was　assembled　with　a　relatively　high　energy　density　of　88.2　Wh　Kg−1　at　a　power　density　of　162　W　Kg−1.　The　device　had　a　high　capacity　retention　rate　of　95%　after　10000　cycles,　and　the　coulomb　efficiency　was　stable　at　99.7%,　showing　the　excellent　stability　of　the　composite.　Therefore,　the　MnO2@HPC-100　composite　has　great　application　prospects　in　energy　storage.　©　2022　Elsevier　Ltd