The invention belongs to the field of construction industry and particularly relates to an air entraining agent for concrete. The air entraining agent for concrete of the invention consists of sodium lauroyl sarcosine, lauric acid, diethanolamide, polyglycol and bone glue. The prepared air entraining agent has the characteristics of good foaming effect, uniform air bubbles and stable foam and hasthe functions of improving the workability and pumpability of concrete and reducing bleeding. The air entraining agent can be widely used in concrete projects such as reinforced concrete, civil structure, highway, bridge and building construction.