The invention provides a blade alloy groove. According to the blade alloy groove, a Stellite alloy plate and the alloy groove are well adhered to each other, brazing filler metal is arranged uniformly, brazing seams are straight, the difficulty of brazing operation is reduced, the quality of brazing is guaranteed, correction to the shape of the alloy groove is reduced, the correction period is shortened, and accordingly the production efficiency is improved. The blade alloy groove comprises an alloy groove transition area and an alloy groove area and is characterized in that both the alloy groove transition area and the alloy groove area respectively comprise a small arc section, a large arc section and a tangent section, and a flat arc serves as the transition between the alloy groove transition area and the alloy groove area. Meanwhile the invention provides a processing method of the blade alloy groove.