The invention discloses a capsule wall board capable of effectively obstructing low-frequency noise. The capsule wall board comprises a core layer made of a PU foaming material, damping layers made offireproof and flame-retardant materials on the both sides of the core layer, and metal face layers on the outer sides of the damping layers, and at least one layer of capsule arrays are dispersed inthe core layer; and capsules are filled with micro powder particles accounting for 20-30% of the volume of inner cavities of the capsules, and the micro powder particles are formed by mixing micro powder A and micro-powder B which have two different particle diameters. From the overall structure, the noise obstructing performance of the wall board is enhanced through a sandwich structure made of multiple layers of different materials, the low-frequency noise which cannot be obstructed by the sandwich structure is further eliminated through a three-dimensional phononic crystal structure constructed by the capsule arrays, the micro powder particles in the capsules vibrate in the transmission process of the noise, especially the low-frequency noise, and energy of the low-frequency noise is effectively consumed.