A nursing bottle having an air returning function comprises a bottle body, a fixing cover, a nipple, a ventilation component, an air conduit, an elastic one-way valve set at a second opening of the air conduit and is located at the interior of the air conduit, a mounting pan located on the second opening of the air conduit to secure the elastic one-way valve. The ventilation component, the air conduit, the elastic one-way valve and the mounting part forms a gas returning device and are located on the interior of the bottle. The present invention reduces the contacting area between the air and the milk, lowering the amount of loss of vitamin. The phenomenon of vomiting milk, choking and flatulence will be omitted since no air bubble is generated.
