The utility model relates to an excavator pin shaft drilling tool clamp which can be used for helping welding a lug plate on an excavator pin shaft. The excavator pin shaft drilling tool clamp is characterized by comprising a main body. The main body is in a cylindrical straight-tube shape, a pair of through holes is arranged on the lateral wall of the main body at the relative positions, a connection line of the through hole vertically intersects the axis of the main body, a limit block is fixed on the outer wall of the main body, one end face of the limit block is aligned at an end face of the corresponding end of the main body, and a limit pin perpendicular to the end face of the limit block is arranged on the end face of the limit block. The tool clamp can guarantee product quality and is high in processing efficiency.