Equivalent　models　of　antennas　are　useful　for　the　fast　simulation　of　vehicle-to-everything　(V2X)　communication.　The　existing　antenna-equivalent　models　are　inflexible　because　they　assume　rectangular　antenna　contour.　This　article　presents　a　hybrid-equivalent　surface-edge　current　model　to　overcome　the　limitation　of　the　existing　equivalent　models.　Based　on　Huygens＇　principle,　a　V2X　communication　antenna　is　equivalent　to　a　conducting　plate　excited　by　equivalent　surface　magnetic　current　(ESMC).　The　sources　of　fields　reflected　by　the　conducting　plate　and　diffracted　by　its　edges　are　modeled　as　the　image　of　ESMC　and　equivalent　edge　current　(EEC),　respectively.　A　hybrid-equivalent　surface-edge　current　model　is　thus　established,　and　it　consists　of　ESMC,　the　image　of　ESMC,　and　EEC.　The　unknown　sources　in　the　proposed　model　are　solved　from　near　fields　of　the　antennas,　and　the　proposed　model　is　then　used　to　simulate　the　radiation　performance　of　antennas　installed　on　vehicles.　The　transmission　coefficient　between　V2X　communication　antennas　can　also　be　calculated　by　using　the　proposed　model　and　the　electromagnetic　reaction　theorem.　Simulations　and　experiments　are　performed　to　demonstrate　the　effectiveness　of　the　proposed　method.　It　is　shown　that　the　proposed　equivalent　model　not　only　accurately　models　antennas　with　arbitrarily　shaped　contour　but　also　significantly　accelerates　the　integrated　simulation　of　antennas　and　vehicles.