The invention belongs to the technical field of building structures, and particularly relates to a composite inner wall with sound absorption and image display functions and application thereof. The composite inner wall with the sound absorption and image display functions comprises a first layer, a second layer, a third layer, a fourth layer and a fifth layer from inside to outside, wherein the first layer is a foundation inner wall, the second layer is a keel, the third layer is a porous sound absorption plate, the fourth layer is a photochromic coating, and the fifth layer is a coated optical filter. According to the composite inner wall with the sound absorption and image display functions and the application thereof, the porous sound absorption material is applied to the inner wall ofa subway train tunnel for sound absorption and noise reduction for the first time, and the problems that when a subway train runs in a following way, the noise coupling reverberation duration of a tunnel train is long, and the sound pressure level is high are solved; and meanwhile, the photochromic technology is combined, the photochromic coating is formed on the surface of the porous sound absorption plate, and therefore a dynamic pattern can be formed on the inner wall of the tunnel, visual fatigue of a driver is eliminated, the attraction of commercial advertisements is improved, and thedual functions of noise reduction and image display are achieved. The coated optical filter matched with the composite inner wall is further additionally arranged, and the noise reduction and image display functions are further improved through the synergistic effect.