An aeration device includes a fluid guiding body, a guiding pipe and a water inlet pipe. The fluid guiding body is an integrally-made structure and has an outlet end. The guiding pipe is disposed through the fluid guiding body. The guiding pipe includes a guiding portion, an end cover and a connecting portion. The end cover is connected to the guiding portion. The connecting portion is integrally connected to the guiding portion and the end cover, and is connected to a rear end of the fluid guiding body. The water inlet pipe is connected to an outer wall of the fluid guiding body and communicated to the fluid guiding body. The water inlet pipe is for inletting a water, the guiding pipe is for inletting an air, and the water and the air are mixed in the fluid guiding body and led out from the outlet end.
