A　MRB　with　dual-coil　structures　was　designed.　The　requirements　of　elevators　with　large　braking　torques　and　good　heat　dissipation　were　met　by　the　structures.　Based　on　the　mathematical　physics　method,　the　multi-physics　model　of　elevator　MRB　was　established　in　COMSOL　Multi-physic　finite　element　software,　namely　the　static　magnetic　field,　flow　field　and　rotor　dynamics　equation,　the　mathematical　model　of　coupled　to　each　other.　The　model　was　used　to　research　dynamic　simulation,　the　braking　torque,　braking　time,　temperature　changes　and　dynamic　performance　of　the　magneto-rheological　braking　device　under　different　current　and　rotational　speed　were　revealed.　Finally,　experimental　verification　was　carried　out,　the　simulation　results　were　consistent　with　the　experimental　ones.　©　2019,　China　Mechanical　Engineering　Magazine　Office.　All　right　reserved.