Introduction　This　research　examines　the　coupling　coordinated　development　dynamics　between　marine　ecological　governance　and　marine　economic　development　in　China＇s　coastal　provinces.　The　marine　ecological　governance　and　economic　development　data　of　China＇s　11　coastal　provinces　were　comprehensively　analyzed　from　2011　to　2021.Methods　We　established　a　multi-dimensional　evaluation　index　system　for　marine　ecological　governance　and　economic　development,　employing　the　global　entropy　weight　method　for　quantification.　Furthermore,　the　research　examines　and　analyzes　the　trends　in　coordinated　development　and　divergence　between　these　two　systems　by　constructing　a　coupled　coordination　degree(CCD)　model,　utilizing　the　Theil　index　decomposition　method,　and　employing　the　geodetector　detector.Results　The　Northern　marine　economic　circle　outperforms　the　Eastern　and　Southern　ones　regarding　marine　ecological　governance,　while　the　Eastern　marine　economic　circle　is　the　most　advanced　in　marine　economic　development.　The　results　of　the　CCD　model　indicate　that　Guangdong,　Shandong,　Hebei,　and　Jiangsu　have　the　best　coupling　coordinated　development,　while　Hainan,　Tianjin,　and　Guangxi　are　at　the　bottom.　The　results　of　the　Theil　index　decomposition　method　indicate　that　intra-regional　disparities　are　the　primary　cause　of　coupling　coordinated　regional　development　variations.　At　the　same　time,　the　results　of　the　geographic　detector　further　substantiate　that　energy　structure,　degree　of　industrial　agglomeration,　and　foreign　overseas　direct　investment　are　the　principal　influencing　factors.Discussion　The　study　presents　policy　recommendations　derived　from　the　findings　intended　to　foster　the　integrated　advancement　of　marine　ecology　and　economy　in　coastal　provinces,　reduce　regional　development　disparities,　and　establish　a　scientific　foundation　for　achieving　a　sustainable　marine　economy.