The　machining　method　of　double-arc　spiral　internal　bevel　gear　with　nutation　drive-by　milling　cutter　was　proposed　in　this　paper.　The　mathematical　modelling　of　milling　cutter　trajectory　and　axial　cut-off　of　forming　milling　cutter　was　established,　the　special　machining　tool　model　of　bevel　gear　was　further　developed　by　Solidcam,　the　simulation　machining　of　bevel　gear　was　carried　out.　Then,　the　gear　model　obtained　after　simulation　was　compared　and　analyzed　with　the　theoretical　gear　model,　and　the　ideal　experimental　results,　confirmed　the　CNC　modelling　milling　method　processing　technology　could　be　used　to　process　bevel　gears,　the　research　is　very　important　to　improve　the　development　of　nutation　dynamic　transmission.　©　2022　Institute　of　Physics　Publishing.　All　rights　reserved.