The invention discloses a compound type foaming agent for infusorial earth. The technical scheme of the foaming agent is characterized in that the compound type foaming agent for the infusorial earth comprises infusorial earth powder, attapulgite clay powder with an air purification function, hydrogen peroxide, dodecyl dimethyl amine oxide, coconut oil diethanol amide, a silicon resin polyether emulsion, polyether modified polysiloxane and water. Firstly the compound type foaming agent for the infusorial earth is burdened and stirred, so that a paste is obtained; and then the compound type foaming agent for the infusorial earth is burdened and stirred, so that a finished product of the compound type foaming agent for the infusorial earth is obtained. The compound type foaming agent for the infusorial earth has the characteristics as follows: the foaming capacity is high, the foaming times are high, the bubble producing amount in unit volume is large, the bubble holes are fine, uniform and not prone to be broken, the product demolding speed is high, the surface smoothness is good, and the product later-term strength is high; a product produced by using the compound type foaming agent for the infusorial earth not only has the effects of heat preservation, thermal insulation and sound insulation, but also has the air purification function; and the compound type foaming agent for the infusorial earth is suitable for being used for producing lightweight slabs, lightweight walls and noise reduction products.