Bidirectional　DC/DC　converters　have　been　widely　used　in　recent　years.　As　the　key　components　of　bidirectional　DC/DC　converters,　magnetic　components　play　an　important　role　in　their　size　and　performance.　In　this　paper,　the　inductor　of　four-phase　interleaved　parallel　DC/DC　converter　is　taken　as　the　research　object.　The　design　of　coupling　inductor　is　studied,　and　a　magnetic　core　structure　of　four-phase　coupling　inductor　is　proposed,　a　mathematical　model　of　the　equivalent　inductor　is　derived　through　theoretical　analysis.　Under　the　condition　that　the　dynamic　performance　remains　unchanged　before　and　after　coupling,　the　inductor　ripple　of　each　phase　is　effectively　reduced　by　the　inverse-coupled　design.　Furthermore,　the　actual　customized　magnetic　components　of　discrete　inductor　and　coupling　inductor　are　fabricated　respectively,　and　the　experimental　prototype　is　built.　The　experimental　results　show　that　the　designed　coupling　magnetic　element　has　positive　effect　on　reducing　the　inductor　current　ripple　and　improving　overall　efficiency　of　the　prototype.　©　2021　IEEE.