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In view of the problem that the general electronic instrument and equipment used for transient parameters testing can not work normally under the influence of strong electromagnetic interference, an overload testing device which can effectively shield the strong electromagnetic interference is designed. The shell structure of the testing device is made of multilayer metal materials with good electromagnetic shielding performance, and the internal structure is filled with polyurethane filling technology. The internal circuit system combines low-power design and data acquisition and storage technology to complete the acquisition and recording of overload parameters during the whole flight process. In the actual firing test of electromagnetic railgun, the test device reliably recorded the overload data of the projectile. The result of the experiment shows that the shell structure of the test device has effective electromagnetic shielding for strong electromagnetic fields，and the internal circuit system has successfully acquired the transient overload parameters of the projectile.