An air blade includes a body, an airflow channel, and an anti-resistance structure. The body has a central axis. The airflow channel is located on one side of the body which is parallel to the central axis of the body. The anti-resistance structure is located on the other side of the body corresponding to the airflow channel. Therefore, the anti-resistance structure can prevent the water resistance, and the air can be led into the water along the airflow channel, so that the air content in the water can be increased.
