The invention relates to an arc end tooth coupling standard member comprising a chassis and arc end teeth. The chassis is provided with a coaxial reference hole, two auxiliary holes are symmetricallyarranged in the positions, located on the outer sides of the outer diameters of the arc end teeth, of the chassis, the bottom surface of the chassis is provided with a first process ring groove, and the outer side wall of the chassis is provided with a second process ring groove. Compared with the prior art, the arc end tooth coupling standard member is advanced in structure and coincided in positioning reference during processing, can completely eliminate and avoid residual stress, can well guarantee dimensions and geometrical tolerances and can effectively meet the inspecting and using requirement of aero-engine arc end tooth coupling parts. The invention also provides a processing method for the above arc end tooth coupling standard member.