Electrolysis, grinding and milling machining tool cathode and method

The invention relates to an electrolysis, grinding and milling machining tool cathode and a method and belongs to the field of electrolysis and grinding combined machining. The tool cathode comprises a rod-shaped base body (1) with the bottom end being a circular plane, wherein a central blind hole (3) is formed in the rod-shaped base body (1); liquid through grooves/holes (2) communicating with the central blind hole (3) are formed in the side wall of the rod-shaped base body (1), are located in the bottom end of the central blind hole (3) and are symmetrically distributed along the central axis of the blind hole; a central circular groove and a plurality of annular grooves concentric with the central circular groove are formed in the outer side of the bottom of the rod-shaped base body (1); and conducting rings and insulating rings are formed respectively. With the adoption of the cathode and the method, the secondary corrosion removal and stray corrosion influence of the bottom surface and the side wall of