The　implementation　of　the　＂Belt　and　Road＇＇　strategy　is　an　important　strategic　support　for　building　a　new　regional　opening　pattern.　It　has　important　strategic　significance　for　cultivating　new　industries　along　the　line　and　developing　new　space　for　the　development　of　the　marine　economy.　All　relevant　coastal　cities　should　actively　use　the　development　strategy　of　this　country　in　the　new　era　and　actively　promote　the　upgrading　and　transformation　of　the　marine　economic　structure.　This　paper　firstly　introduces　the　opportunities　brought　by　the　＂One　Belt　and　One　Road＇＇　to　the　marine　industry　of　China＇s　coastal　provinces,　and　analyzes　the　main　problems　existing　in　the　development　of　marine　economic　industry　in　China＇s　coastal　provinces.　Then,　the　North　Bay　is　taken　as　an　example　to　propose　the　marine　industry　selection　and　system　construction.　Finally,　it　expounds　the　path　of　the　adjustment　of　the　marine　economic　industrial　structure　of　China＇s　coastal　provinces　under　the　＂Belt　and　Road　Initiative＂　initiative.　It　is　expected　to　promote　the　cooperation　and　exchange　of　higher-level　marine　economy　among　the　countries　and　regions　along　the　coastal　cities　of　China　and　the　Maritime　Silk　Road,　and　promote　the　development　of　marine　economy　in　China＇s　coastal　cities.