As　an　important　branch　of　non-destructive　testing,　electromagnetic　ultrasonic　testing　is　widely　used　in　various　industries　because　of　its　high　detection　efficiency　and　the　lack　of　a　need　for　the　test　sample　to　have　a　coupling　agent　or　a　surface　pretreatment.　As　a　core　component　of　electromagnetic　ultrasonic　testing,　electromagnetic　acoustic　transducers　(EMATs)　have　received　extensive　attention　in　recent　years.　However,　the　mode　selectivity　of　EMATs　is　reduced　because　of　the　non-uniformity　of　the　magnetic　field　of　traditional　permanent　magnets　and　the　multimode　phenomenon　of　guided　waves.　To　solve　this　problem,　an　omni-directional　magnetic-concentrator-type　electromagnetic　acoustic　transducer　(OD-MC-EMAT)　is　proposed　herein.　Which　was　added　to　the　magnetic　concentrator　on　a　traditional　EMAT　to　guide　and　concentrate　the　magnetic　field　of　traditional　permanent　magnets,　thereby　improving　the　defect　inspection　ability　of　the　EMAT.　The　proposed　OD-MC-EMAT　consisted　of　a　cylindrical　permanent　magnet,　an　omni-directional　magnetic　concentrator,　and　a　multi-cluster　of　circular　meander　coils,　and　it　exhibited　better　mode　selectivity　than　a　traditional　EMAT.　A　finite　element　simulation　and　an　experiment　proved　that　the　mode　selectivity　of　the　transducer　improved　after　adding　the　magnetic　concentrator,　and　experiments　to　study　the　transducer　characteristics　and　defect　detection　were　also　carried　out.　Finally,　the　configuration　of　the　OD-MC-EMAT　was　optimized　through　an　orthogonal　experiment.　The　influence　of　each　parameter　on　the　transducing　efficiency　of　the　proposed　OD-MC-EMAT　was　studied,　and　the　optimal　parameter　combination　was　confirmed.