The utility model relates to an auxiliary repair tool for a GCB. The tool comprises a pedestal and two support plates, a slide rail is arranged between the two support plates, the slide rail is in sliding connection with the pedestal, the support plates are provided with telescopic positioning mechanisms respectively, the positioning mechanisms abut against the GCB, the two support plates are connected with a cross-arm, a connecting seat, two upper support arms and two lower support arms are arranged under the cross-arm, the two upper support arms are hinged to the connecting seat, the upper support arms are in pin joint with the lower support arms correspondingly to form elbow portions, the elbow portions are in threaded connection with screws respectively, one end of each screw is provided with a locking nut, the other end of the screw penetrates through one support plate and extends out of the support plate, a pressure plate is arranged at the bottom ends of the two support arms, and the two support arms are hinged to the pressure plate. The auxiliary repair tool for the GCB has the advantages that the screws are rotated to rotate the upper and lower support arms, and thus a force required by crimping of a GCB static contact is provided, the static contact can be flattened and uniformly pressed into the GCB in one time, and the crimping effect is better.