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The stability of the armature exit velocity is the key performance indicators of the electromagnetic rail launch system. It is an effective way to improve this key indicator by real-time speed detection and feedback control in electromagnetic launch test. The differential B-dot is used as the sensor for the velocity detection of the armature in the emitter. The operational amplifier, voltage comparator and gate circuit are used to make the real-time detection module and pulse width comparison module, extract the time of the armature through B-dot and determine whether the armature velocity reaches the set threshold. The real-time speed detection process is delayed by 2μs, the output results provide input to the feedback control decision of the armature velocity of the electromagnetic rail launch system.