Since it is important to judge the metal bridge wire completely detonated whether or not in the metal bridge wire explosion experiment, a method was proposed to judge the detonation state of the bridge wire by the electromagnetic pulse radiation effect. The electromagnetic pulse signal of the metal bridge wire during the detonation process was measured by the antenna, while the measured electromagnetic pulse signal was analyzed to judge the bridge wire detonation status. The electromagnetic pulse signal shows that the electromagnetic pulse generated by the complete detonation and the incomplete detonation state, has a significant difference in duration and radiation spectrum. When the bridge wire is completely detonated, the electromagnetic signal duration in the intrinsic explosion phase is short, and the electromagnetic signal generated in the plasma phase lasts long. The electromagnetic pulse signal includes high frequency electromagnetic radiation of 90 MHz to 100 MHz. When the bridge wire is not completely detonated, the electromagnetic signal generated during the intrinsic explosion phase lasts for a long time, while the electromagnetic signal generated during the plasma phase has a short duration. The frequency of the electromagnetic pulse signal is mainly concentrated in the low frequency region below 40 MHz.