The invention discloses an unfired lime foaming acoustical board. According to the technical scheme, the unfired lime foaming acoustical board is characterized in that a built-in frame is horizontally placed on a mold, after short steel pipes in the built-in frame are inserted into stand columns, lime cement foaming agent is poured on the periphery of the built-in frame, the built-in frame is totally inlaid in the lime cement foaming agent, maintenance is performed according to a conventional cement product maintenance method, and packaging is performed to form an unfired lime foaming acoustical board finished product; the lime cement foaming agent is prepared from quick lime, high-viscosity attapulgite clay powder, cement and other raw materials; the lime cement foaming agent and the built-in frame form an integrated whole after the lime cement foaming agent is cured, and thus the overall strength, the bending resistance and the actual using effect of the unfired lime foaming acoustical board are improved. The unfired lime foaming acoustical board not only can be used for effectively controlling noise pollution but also has the functions of heat preservation and air purification and is suitable for being mounted in facilities such as expressways, viaducts, urban light rails, subways, public places and the like.