The utility model relates to the technical field of electrical equipment production, in particular to a fixing tool for an insulation test. The fixing tool for the insulation test comprises a base, the base is provided with a first vertical frame and a second vertical frame which are used for electrical grounding during a test. The first vertical frame and the second vertical frame are oppositelyarranged at intervals in the horizontal direction, a first end connecting hole used for being fixedly connected with one end of a contact box is formed in the first vertical frame, a second end connecting hole used for being fixedly connected with the other end of the contact box is formed in the second vertical frame, and a receding channel used for receding a protruding section of the contact box is formed in the first vertical frame or the second vertical frame. By using the fixing tool, the state of the contact box in actual work can be completely simulated, the possibility that a test result has a large error due to the fact that the test state and the work state of the contact box are different is greatly reduced, and the insulation test accuracy of the contact box is higher.