Transition　metal　selenides　are　considered　as　promising　anode　materials　for　potassium-ion　batteries　(PIBs)　due　to　their　high　theoretical　capacities.　However,　their　applications　are　limited　by　low　conductivity　and　large　volume　expansion.　Herein,　sugar-gourd-shaped　carbon　nanofibers　embedded　with　heterostructured　ZnCo-Se　nanocages　are　prepared　via　a　facile　template-engaged　method　combined　with　electrospinning　and　selenization　process.　In　this　hierarchical　ZnCo-Se@NC/CNF,　abundant　phase　boundaries　of　CoSe2/ZnSe　heterostructure　can　promote　interfacial　electron　transfer　and　chemical　reactivity.　The　interior　porous　ZnCo-Se@NC　nanocage　structure　relieves　volume　expansion　and　maintains　structural　integrity　during　K+　intercalation　and　deintercalation.　The　exterior　spinning　carbon　nanofibers　connect　the　granular　nanocages　in　series,　which　prevents　the　agglomeration,　shortens　the　electron　transport　distance　and　enhances　the　reaction　kinetics.　As　a　self-supporting　anode　material,　ZnCo-Se@NC/CNF　delivers　a　high　capacity　(362　mA　h　g-1　at　0.1　A　g-1　after　100　cycles)　with　long-term　stability　(95.9%　capacity　retention　after　1000　cycles)　and　shows　superior　reaction　kinetics　with　high-rate　K-storage.　Energy　level　analysis　and　DFT　calculations　illustrate　heterostructure　facilitates　the　adsorption　of　K+　and　interfacial　electron　transfer.　The　K+　storage　mechanism　is　revealed　by　ex　situ　XRD　and　EIS　analyses.　This　work　opens　a　novel　avenue　in　designing　high-performance　heterostructured　anode　materials　with　ingenious　structure　for　PIBs.　Sugar-gourd-shaped　carbon　nanofibers　embedded　with　heterostructured　ZnCo-Se　nanocages　are　prepared　via　a　facile　template-engaged　method　combined　with　electrospinning　and　selenization　process.　Benefiting　from　interfacial　effects　of　the　CoSe2/ZnSe　heterostructure,　rapid　K+　diffusion　of　hollow　porous　nanocage　structure,　and　shortened　multiple　electron　transport　channels　of　spun　carbon　nanofibers,　ZnCo-Se@NC/CNF　as　a　self-supporting　anode　material　exhibits　excellent　potassium　storage　performance.image