In order to explore the electromagnetic field safety threshold of electro-explosive devices（EEDs） and provide a sensitivity evaluation benchmark for the study of electromagnetic compatibility and electromagnetic environmental effects of EEDs， based on the electromagnetic thermal coupling model of EEDs， white light interference method was used to test the electromagnetic field response characteristics of No.14 EED. The effect relationship between electromagnetic field coupling， self sensitivity， and electromagnetic response of EEDs was studied， a test method and calculation method for the electromagnetic field safety threshold of EEDs have been developed， and the electromagnetic field safety threshold of No.14 EED has been obtained within the frequency range of 10 kHz-18 GHz. The results indicate that the sensitive frequency range of No.14 EED is between 40 MHz and 1 GHz.