Single-crystal　CeB6　tips　with　different　curvature　radii　are　prepared　simply　and　efficiently　by　using　an　independently　designed　electrochemical　corrosion　device;　the　average　preparation　time　of　a　tip　was　only　about　2.75　h.　The　field　emission　performance　test　results　show　that　the　single-crystal　CeB6　tip　exhibits　excellent　field　emission　performance.　When　the　applied　voltage　was　2550　V,　the　current　density　of　a　tip　with　a　curvature　radius　of　about　500　nm　is　2.11x10(4)　A/cm(2),　and　as　the　curvature　radii　increases,　the　field　emission　current　density　drops　sharply.　The　first　principle　calculation　of　the　electronic　structure　and　work　function　of　single-crystal　CeB6　under　an　electric　field　show　that　the　free　electron　energy　of　single-crystal　CeB6　increases　and　is　enriched　at　the　surface　under　a　strong　electric　field　of　0.1　V/angstrom,　with　a　reduced　surface　barrier.　The　CeB6　work　function　under　the　strong　electric　field　was　greatly　reduced,　which　is　conducive　to　electron　emission.　By　calculating　the　difference　between　the　vacuum　level　and　the　Fermi　level,　a　surface　work　function　of　0.42　eV　with　an　applied　electric　field　of　0.1　V/angstrom　of　CeB6　was　obtained.　This　provides　theoretical　support　for　the　single-crystal　CeB6　tip　exhibiting　excellent　field　emission　performance.