Disclosed is an active RF decoy simulation apparatus for simulating an active RF decoy system in virtual environment, comprising: a missile seeker which radiates RF signals and detects reflection signals from the target ship, a target motion simulator for implementing the moving trajectory of active RF decoy, in which an antenna for radiating the reflected signal of the target ship and another antenna for radiating the deception signal of the active RF decoy according to the transmitted missile signal are mounted, a microwave device which transfers the detected signal radiated from the missile to the antenna so that the reflected signal of the target ship is radiated by the target motion simulator and which receives the signal radiated from the missile, amplifies the received signal and transfers the signal to the antenna so that a repeated delay signal of the RF decoy simulator which is greater than the reflected signal of the target ship is radiated by the target motion simulator, a missile seeker control device which controls the missile seeker, a target motion simulator control device which controls the target motion simulator, and a virtual environment simulation device which controls the microwave device which controls the radiation of the signal of the RF decoy simulator, and the missile seeker control device.