The work aims to study the effect of magnetic particles grinding on removing the burr of Al7075 cross hole, and improve the grinding quality and burr removal efficiency. Firstly, cylinder magnetic pole was slotted in axial and radial direction respectively, and ANSOFT software was used to simulate the magnetic field of the magnetic pole to analyze the magnetic induction changes of three different shapes of magnetic poles. Secondly, the inner surface of the cross hole was ground and edge burr was removed by magnetic particles. Finally, the surface morphology, material removal, burr height and surface roughness of cross hole were measured. When the grinding time was 10 min, the magnetic pole speed was 1500 r/min and the magnetic pole was slotted in the radial direction, the material removal was up to 46 mg, the surface roughness of the hole was reduced to Ra 0.5 μm from the original Ra 1.5 μm, the grinding effect of hole inner surface was ideal, and the edge burr was completely removed. When the magnetic pole was non-slotted grinding, the material removal amount was 40 mg, the surface roughness was reduced to Ra 0.65 μm, and the edge burr was almost completely removed. When the magnetic pole was slotted in the axial direction, the surface roughness was reduced to about Ra 0.8 μm, the material removal amount was about 30 mg, and the residual burr height was about 5 μm. When the grinding time is 10 min and the magnetic pole speed is 1500 r/min, the grinding effects of the inner surface of cross hole of Al7075 by magnetic abrasive particles with radial slotted magnetic is better and the burr removal efficiency is higher than that with the axial slotted magnetic pole and non slotted magnetic pole.