The invention provides an infrared dynamic scene simulation device and method. The infrared dynamic scene simulation device comprises a brightness modulator, a bitmap modulator, a drive control computer, a scene simulation computer and a collimating lens, wherein light emitted by the broadband light source sequentially passes through the brightness modulator, the bitmap modulator and the collimating lens; the drive control computer is electrically connected with the brightness modulator and the bitmap modulator and synchronously controls the brightness modulator and the bitmap modulator; and the scene simulation computer is electrically connected with the drive control computer to generate an infrared dynamic scene digital image. A design scheme of serial cascade connection of two groups of digital micro-mirror arrays is adopted, and through synchronous modulation of the two groups of micro-mirror arrays, ultrahigh frame frequency dynamic display of an 8-bit gray scale scene image is realized on the premise of not losing image resolution, gray scale and contrast.