The invention discloses a powdery attapulgite foaming agent. The technical scheme has the following key points: the powdery attapulgite foaming agent is composed of active attapulgite clay, sodium percarbonate, sodium pyrophosphate, lauryl sodium sulfate, sodium polyacrylate and poly-naphthalene formaldehyde sodium sulfonate. The finished product of the powdery attapulgite foaming agent is prepared by stirring, grinding and packaging the ingredients. The powdery attapulgite foaming agent has the advantages that the foaming agent is high in foaming capacity, more in bubbling times and large in unit volume foam production quality, and enables the outer films of foams to have good toughness so as to guarantee the foams not to be easily broken; the foams are good in stability, can exist for a long time without being defoamed, and are fine and smooth; holes generated in a medium are even in sizes; the water secretion quantity is low; and the used medium is good in compatibility, etc. The products produced by the powdery attapulgite foaming agent not only can effectively control the noise pollution, but also have the functions of heat preservation and air purification; and the powdery attapulgite foaming agent is suitable for producing light weight boards, light weight walls and noise reduction products.