The invention relates to the technical field of magnetic steel machining, in particular to a magnetic steel grinding device. The magnetic steel grinding device comprises a base and further comprises amain machine frame connected to the edge of the upper end of the base in a clamped manner, an operation frame connected to the middle of the upper side of the base in a clamped manner, cross beams connected to the upper portion of the main machine frame in a screwed manner through threads, a machine box arranged on the cross beams in sliding and sleeving manners, a motor and a grinding component.The operation frame comprises a base, first clamping connection blocks, first supporting rods, first locating pieces connected to the upper ends of the first supporting rods in a screwed manner through threads, a bearing frame, first springs arranged on the first supporting rods in a sleeving manner and tightly pressed between the first locating pieces and the base, a second locating piece, a second supporting rod, a bearing piece and a second spring. The operation frame of the magnetic steel grinding device can buffer external impact force, a great number of cutters are arranged, and grinding is uniform.