The invention discloses a flexible foldable radar infrared characteristic synthesis simulation matching device. The device is arranged at the periphery of a space attitude stabilization flexible bodyunfolding forming device, is mounted in a folded manner along with the space attitude stabilization flexible body unfolding forming device before working, and is unfolded along with the space attitudestabilization flexible body unfolding forming device during working. The outermost layer is a radiation layer and is used for simulating the infrared radiation characteristic of a projectile nose, and space electromagnetic waves are transmitted to an intermediate layer. The intermediate layer is a wave-absorbing layer, and is used for absorbing electromagnetic waves transmitted through the radiation layer. The innermost layer is a reflecting layer and is used for reflecting electromagnetic waves which are not adsorbed by the wave-absorbing layer so as to simulate the radar target characteristic of the projectile nose. The device can simulate the infrared and radar characteristics of a matching target simultaneously, the multi-sensor detection data highly-integrated anti-recognition requirement of the conventional defensive system is met, the device is small in occupied space and light in weight, and the using requirement of missile on-missile space quality limitation is met.