The utility model relates to a center hole grinding centre which comprises a taper shank and a taper head. The center hole grinding centre is characterized in that the taper head is a hexahedron taper head, the taper angle of the taper head is 55 degrees to 65 degrees, the edges where two adjacent taper faces of the taper head are intersected are connected through connecting arcs, and the chord length of each connecting arc is 0.15mm to 0.3mm. The center hole grinding centre is simple in structure, easy to manufacture, low in cost and convenient to use and install, the arcs are used for connection, the run-out errors at the highest point of the longitudinal section of the center hole grinding centre are reduced, the locating accuracy is high, the circular degree, the roughness and the grinding efficiency of the locating taper face of a grinded center hole are improved, the grinding time and the grinding cost are saved, and the economical benefits are good.