Due　to　its　slow　kinetics　and　complicated　multiphase　development　during　cycling,　developing　anode　materials　for　sodium/potassium-ion　batteries　(SIBs/PIBs)　with　high-rate　and　long-cycle　simultaneously　is　still　crucial　and　challenging.　Additionally,　the　application　of　abundantly　available,　waste　biomass　to　energy　storage　device　has　become　a　research　hotspot.　Herein,　using　waste　leather　as　the　adsorbent　and　bioreactor,　we　facilely　fabricating　the　leather　derived　N/P　co-doped　carbon　fiber　composite　with　MoS2　nanocrystals　after　sulfuration　treatment.　Due　to　the　intrinsic　advantage　of　texture　and　component　of　collagen　fiber,　the　ultrasmall　MoS2　nanocrystals　are　evenly　embedded　with　N/P　co-doped　carbon　fibers.　As　expected,　the　MoS2/NP-C　anode　shows　enhanced　sodium/　potassium　storage　capacity.　It　exhibits　a　high　specific　capacity　(368　mAh　g-1　at　0.2　A　g-1)　for　PIBs　and　amazing　long-term　cycling　qualities　(241　mAh　g-1　at　1　A　g-1　even　after　2500　cycles)　for　SIBs.　This　work　provides　further　insight　into　the　application　of　waste　biomass　for　fabricating　nanocomposite　in　energy　storage.