Dynamic　inductance　is　an　important　parameter　that　reflects　the　dynamic　characteristics　of　the　electromagnetic　switch　during　the　movement　process.　Its　accurate　and　rapid　identification　is　of　great　significance　to　the　optimization　and　control　of　the　electromagnetic　switch.　In　the　actual　operation　process　of　electromagnetic　switch,　the　dynamic　inductance　of　electromagnetic　mechanism　is　affected　by　the　coil　current　and　the　working　air　gap,　and　it　changes　non-linearly,　which　makes　it　difficult　to　identify.　For　this　reason,　this　paper　proposes　a　dynamic　inductance　identification　model　based　on　the　discrete　differential　equation.　The　coil　voltage　and　current　are　used　as　input　of　the　model,　which　considers　the　online　self-correction　method　of　coil　resistance.　It　realizes　the　identification　of　dynamic　inductance　of　electromagnetic　switch　under　PWM　closed-loop　control.　At　the　same　time,　a　three-dimensional　finite　element　co-simulation　model　of　the　electromagnetic　switch　considering　the　collision　bounce　is　established,　and　the　dynamic　inductance　is　obtained　by　the　method　of　electromagnetic-mechanical　coupling.　The　calculation　results　of　the　inductance　identification　model　are　compared　with　the　co-simulation　model,　and　the　reliability　and　accuracy　of　the　identification　model　are　verified.　It　lays　a　foundation　for　further　intelligent　control　of　electromagnetic　switch.　©　2022,　The　Author(s),　under　exclusive　license　to　Springer　Nature　Singapore　Pte　Ltd.