The invention discloses a powdery kieselguhr foamer, wherein the essential of the technical scheme is as follows: the powdery kieselguhr foamer is composed of dried kieselguhr, high-viscosity attapulgite clay powder, sodium dodecyl sulphate, sodium percarbonate, sodium polyacrylate, sodium pyrophosphate and sodium naphthaldehyde sulfonate. The powdery kieselguhr foamer finished product is obtained by stirring, grinding and packaging the ingredients of the powdery kieselguhr foamer. The powdery kieselguhr foamer has the advantages of being strong in foaming capacity, high in foaming times, high in foam production amount per unit volume, good in the toughness of foam outer membranes with low possibility of breaking, good in foam stability, unable to defoam for a long time, fine in foam, uniform in the size of the holes generated in a medium, low in bleeding amount, good in the compatibility of the used medium, and the like. The products produced by virtue of the powdery kieselguhr foamer are capable of effectively controlling noise pollution, and have the functions of insulating heat and purifying air; and the powdery kieselguhr foamer is suitable for producing light-weight boards, light-weight wall bodies as well as silencing and noise-reducing products.