Potassium-ion　batteries　(PIBs)　are　of　academic　and　economic　significance,　but　still　limited　by　the　lack　of　highly　active　electrode　materials　for　de-/intercalation　of　large-radius　K　ions.　Herein,　an　interconnected　nitrogen/sulfur　co-doped　carbon　nanosheep　bundle　(N/S-CSB)　was　proposed　as　the　potassium　ions　storage　material.　The　rich　co-doping　of　nitrogen/sulfur　of　N/S-CNB　with　three-dimensional　hierarchical　bundled　array　structure　yields　distensible　interlayer　spaces　to　buffer　the　volume　expansion　during　K+　insertion/extraction,　offers　more　electrochemical　active　sites　to　obtain　a　high　specific　capacity,　and　provides　efficient　channels　for　fast　ion/electron　transports.　Therefore,　the　N/S-CSB　anode　achieved　high　reversible　specific　capacity　of　365　mAh/g　obtained　at　50　mA/g　after　200　cycles　with　a　coulombic　efficiency　(CE)　close　to　100%,　high　rate　performance　and　long　cycle　stability.　Moreover,　the　in-situ　Raman　spectra　indicated　outstanding　reaction　kinetics　of　as-prepared　N/S-CSB　anode.　[Figure　not　available:　see　fulltext.]　©　2021,　Tsinghua　University　Press　and　Springer-Verlag　GmbH　Germany,　part　of　Springer　Nature.