Carbonaceous　nanomaterials　with　porous　structure　have　become　the　highly　promising　anode　materials　for　potassium-ion　batteries　(PIBs)　due　to　their　abundant　resources,　low-cost,　and　excellent　conductivity.　Nevertheless,　the　sluggish　reaction　kinetics　and　inferior　cycling　life　caused　by　the　large　radius　of　K　ions　severely　restrict　their　commercial　development.　Herein,　B,N　co-doped　hierarchically　porous　carbon　nanosheets　(BNPC)　are　achieved　via　a　facile　template-assisted　route,　followed　by　a　simple　one-step　carbonization　process.　The　resultant　BNPC　possesses　a　unique　porous　structure,　large　surface　area,　and　high-level　B,N　co-doping.　The　structural　features　endows　it　with　remarkable　potassium　storage　performances,　which　delivers　a　high　reversible　capacity　(242.2　mAh/g　at　100　mA/g　after　100　cycles),　and　long　cycling　stability　(123.1　mAh/g　at　2000　mA/g　and　62.9　mAh/g　at　5000　mA/g　after　2000　cycles,　respectively).　Theoretical　simulations　further　validate　that　the　rich　B　doping　into　N-modified　carbon　configuration　can　greatly　boost　the　potassium　storage　capability　of　the　BNPC　anode.　(C)　2021　Published　by　Elsevier　B.V.　on　behalf　of　Chinese　Chemical　Society　and　Institute　of　Materia　Medica,　Chinese　Academy　of　Medical　Sciences.