The utility model relates to a phantom for measuring the error of a neuronavigation system. The error of the neuronavigation system is effectively measured, the accuracy, reliability and effectiveness of the neuronavigation system are guaranteed, and the success rate of an operation is improved. According to the structure of the phantom, a glass base is square, a round groove is formed in the center of the glass base, evenly-distributed glass stand column inserting holes are formed in the bottom plane of the groove, cylindrical glass stand columns different in length are vertically inserted into the inserting holes respectively, a round hole for testing the accuracy of the neuronavigation system is formed in the top of each glass stand column, a glass cover is in a hollow cylinder shape, the bottom of the glass over and the upper face of the glass base are sealed and fixed together, all the glass stand columns inserted into the bottom plane of the groove are covered with the glass cover, and a liquid injection hole is formed in one side of the top of the glass cover. The phantom is simple in structure, novel, unique, easy to produce and manufacture, convenient to use, low in cost and good in use effect, and can be effectively used for measuring the error of the neuronavigation system, and the accuracy, reliability and effectiveness of the neuronavigation system are guaranteed.