The work aims to investigate the mechanism of removing the burr of TC4 hole by magnetic particle finishing and seek the best technological process for removing burr of TC4 hole. Firstly, the basic principle of magnetic particle grinding was analyzed respectively for single track motion and compound track motion of magnetic pole. Secondly, the magnetic field strength and cutting force at the edge of the hole were simulated by ANSOFT and ANSYS software respectively. Finally, the grinding removal test was carried out by magnetic particle grinding, and the burr height and micromorphology were measured by the ultra deep 3D microscope. When the process way was single track motion, the rotation speed of the magnetic pole was 2000 r/min, the height of the burr of the edge of the TC4 hole was reduced to about 5 μm from the original 60 μm after 15 min grinding. When process way was compound track motion, the rotation speed of the magnetic pole was 2000 r/min, the magnetic pole revolution speed was 30 r/min, the process time was 12 min, and the burr of the TC4 hole edge was removed absolutely and the micromorphology of the surface of hole was better. When the process way is compound track motion, the removal efficiency of burr is further improved compared with that in the traditional single track motion of the magnetic pole, and the micromorphology of the surface of the TC4 hole is greatly improved.