Abstract: SWRH82B hard wire steel is prone to severe center segregation and inheritance to hot-rolled wire rod in the continuous casting production process, forming core martensite, which in turn leads to pull-out fracture. In order to improve the central segregation of the cast billets and enhance product quality, the pulsed magneto oscillation(PMO)technology to homogenize the SWRH82B hard wire steel continuous casting billet was used, which improved the quality of the cast billet and the microstructure uniformity of the hot-rolled wire rod. The results show that after PMO treatment, the central equiaxial grain area rate of SWRH82B cast billet increases from 19.7% to 26.0%. The degree of central shrinkage porosity decreases from level 1 to 0.5, the central carbon segregation index reduces from 1.20 to 1.10, and the segregation of Cr and Mn elements in the central area is almost eliminated. The abnormal martensite structure in the center of the rod noticeably reduces, decreasing from levels 2.0-2.5 to levels 0-0.5, which is beneficial in reducing the tendency for rod breakage.