The present invention relates to a milling cutter provided with an equidistant arc head on an eccentric shape flank surface and a grinding method, the cutter can reduce the vibration during the process of processing of different hardness of hardened steels for splicing of a mould, the cutter life and workpiece surface quality can be improved, the flank surface shape can be changed, and the cutter tip strength can be improved. The milling cutter is an overall hard alloy end milling cutter. The milling cutter includes a cutter shank (1) and the arc head (2), the arc head includes a large curvature arc (2-1) and a small curvature arc (2-2). Tooth-spacing angles are 87 degrees, 93 degrees, 87 degrees, and 93 degrees, tooth-spacing vertical angles are equal, helix angle (r) is 38 degrees, helix angle (v) is 40 degrees, and cutter end cutting edge flank surface (10) and circumferential cutting edge (6) are in eccentric shape. Front angle is in the range of 0-3 degrees, first clearance angle is in the range of 8-10 degrees, and second clearance angle is in the range of 15-22 degrees. The center position of the cutter is provided with cooling channels (3), the number of the cooling channels is four, and the four cooling channels respectively are located four cutting edge end tooth chip pockets. The present invention also provides a reference for the grinding of the cutter of the type.