The invention discloses a generating method cycloid tooth bevel gear grinding method. The generating method cycloid tooth bevel gear grinding method comprises the following steps: first, the generating surface and the theoretical tooth surface of a generating method cycloid tooth bevel gear are determined; second, a generating wheel is replaced with a conical surface grinding wheel, and shape parameters of the grinding wheel are determined; third, after generating wheel replacement, mounting parameters of the grinding wheel are determined again; fourth, high-order motion coefficients and different rolling cut center cradle angles are introduced into adjustment parameters of a machine tool for gear grinding machining, and thus shape correction of the ground gear surface is more flexible; fifth, the adjustment parameters of the machine tool and higher-order correction coefficients are optimized to minimize a gear shape deviation caused by generating wheel replacement; and sixth, full numerical control gear grinding tool position of the generating method cycloid tooth bevel gear is calculated. According to the generating method cycloid tooth bevel gear grinding method, the gear surface of the generating method cycloid tooth bevel gear can be efficiently ground, meanwhile, the ground gear surface shape can be controlled well, and the meshing transmission quality of the ground gearsurface and a matched gear is guaranteed.