During　the　operation　of　the　low-voltage　cable,　due　to　external　force　pulling,　oxidation　corrosion　and　other　reasons,　it　is　easy　to　cause　damage　and　aging　of　the　cable　insulation　skin,　and　produce　arc　at　the　local　damage　location.　Based　on　the　magnetohydrodynamics　theory,　an　electromagnetic-fluid　coupling　simulation　method　of　low　voltage　cable　arc　is　proposed.　Trilinear　interpolation　method　is　used　to　solve　the　problem　of　data　mapping　between　heterogeneous　grids　in　3D　multi-physical　coupling　process.　A　method　for　multi-thread　parallel　computing　is　established.　The　task　of　each　thread　is　dynamically　allocated　to　improve　the　efficiency　of　data　mapping　between　solvers.　Based　on　the　simulation　method,　the　dynamic　process　of　BVVB　two-core　cable　arc　is　calculated.　The　accuracy　of　the　simulation　is　verified　by　experiment.　©　Beijing　Paike　Culture　Commu.　Co.,　Ltd.　2023.