The invention discloses an indoor sound-insulation wall poster. The wall poster comprises a base layer, a sound-insulation layer and a coating layer, wherein a waterproof layer is arranged on the upper surface of the base layer, and a back adhesive layer is arranged on the lower surface of the base layer; the sound-insulation layer is arranged on the waterproof layer, and comprises a plurality of high-moisture-absorption resin balls which are closely arranged; the coating layer coats the sound-insulation layer; the coating layer and the base layer form a closed space to seal the high-moisture-absorption resin balls; and the surface of the coating layer is convex and concave. According to the indoor sound-insulation wall poster, moisture which is low in cost is used as a sound-insulation medium, the high-moisture-absorption resin balls for absorbing moisture have the effects of large moisture absorption amount and good moisture retaining effect. The sound-insulation wall poster has the advantages of good sound insulation effect, temperature preservation and fireproofing, is warm in winter and cool in summer, is easy to clean, low in cost and convenient to use, has an attractive appearance, and can be used as a decorating item.