Single-crystal　LaB6　field　emission　tips　have　strong　anti-poisoning　ability,　good　emission　stability,　high　emission　current　density　and　mature　applications.　As　such,　they　have　attracted　much　attention　in　field　emission　research.　In　this　paper,　an　electrochemical　corrosion　device　is　designed　to　enable　the　simple　and　efficient　preparation　of　single-crystal-LaB6　tips　with　different　radius　of　curvature　values.　Computer　simulation　technology　is　used　to　study　the　field　emission　behavior　of　the　single-crystal　LaB6　tip　and　provides　the　theoretical　basis　for　the　calculation　of　field　emission　current　density.　The　results　show　that　the　preparation　process　is　automated,　more　efficient　and　more　controllable　than　previous　methods.　When　the　applied　voltage　was　2250　V,　the　single-crystal　LaB6　tip　achieved　maximum　emission　current　density　of　2.05　x　10(4)　A/cm(2)　at　a　radius　of　curvature　of　0.5　mu　m.