Magnetic　Barkhausen　noise　(MBN)　is　a　useful　signal　for　non-destructively　characterizing　various　properties　of　ferromagnetic　materials.　It　is　suggested　that　MBN　is　mainly　generated　at　grain　boundaries　because　there　are　more　pinning　sites　around　grain　boundaries.　However,　direct　experimental　proof　is　difficult　because　of　the　lack　of　high-spatial-resolution　MBN　sensor.　This　study　focuses　on　examining　MBN　around　grain　boundaries　using　a　custom-made　high-spatial-resolution　MBN　sensor.　Firstly,　the　magnetic　domains　and　grain　structure　of　an　electrical　steel　were　obtained　using　a　magneto-optical　Kerr　effect　microscope.　Then,　MBN　signals　inside　grains　and　around　grain　boundaries　were　measured　using　the　high-spatial-resolution　MBN　sensor.　The　experimental　results　reveal　that　MBN　signals　are　more　evident　around　grain　boundaries,　32.5%-435.7%　larger　than　that　in　the　grain　interior.　Based　on　the　experimental　measurement,　two-dimensional　MBN　mapping　of　the　area　containing　grain　boundaries　was　carried　out,　enabling　the　identification　of　the　location　of　grain　boundaries　in　millimeter-scale　grains.