The invention relates to an accessory of a drilling machine, in particular to a contact finger positioning tool. The contact finger positioning tool comprises a base and a center positioning shaft rotationally assembled on the base; two clamping positioning pieces for clamping contact fingers are arranged on the center positioning shaft; an indexing mechanism is arranged between the center positioning shaft and the base, and comprises an indexing disk and a clamping block clamped in the indexing disk; the clamping block is clamped in a concave part of a concave-convex structure to position thecenter positioning shaft in the circumferential direction; the contact finger positioning tool is also provided with a drilling die plate to determine the position of the tool relative to a drillingmachine. The contact finger positioning tool determines the position of the tool relative to the drilling machine, the positions of the contact fingers on the center positioning shaft are positioned by the clamping positioning pieces, the indexing mechanism determines the angle between two adjacent perforations in the circumferential direction; compared with an original scheme that the drilling position is determined through marking by a bench worker, the processing precision is improved, the stability of the contact fingers in processing is improved, and the quality of the processed contact fingers is further improved.