In　order　to　detecting　submarine　cable　under　ocean　currents,　this　paper　based　on　the　principle　of　electromagnetic　induction,　derive　the　mathematical　model　which　reflects　the　signal　change　of　tri-axial　magnetic　sensor　move　in　the　magnetic　field　genered　by　submarine　cable,　and　give　a　algorithm　and　scheme　to　dynamically　searching　and　locating　submarine　cable.　This　algorithm　can　relatively　accurately　calculate　the　position　of　submarine　cable　when　the　forward　direction　of　sensor　is　deviated　or　the　horizontal　axis　is　deflected.　Finally,　the　method　was　simulated　with　MATLAB,　and　the　results　proved　effectiveness　of　the　algorithm　and　feasibility　of　the　scheme.　©　2022,　The　Author(s),　under　exclusive　license　to　Springer　Nature　Singapore　Pte　Ltd.