Abstract: A device capable of preventing deformation of an inflating valve on an inflatable article, includes a solid plug member for press-fitting into an air inlet of the inflating valve, a protective ring to be sleeved on a flexible plug unit of the inflating valve, and a connecting section which is disposed between the solid plug member and the protective ring. The connecting section has a length sufficient to straighten a connecting portion of the inflating valve between a flexible valve body and the flexible plug unit once the solid plug member is press-fitted into the air inlet and the protective ring is sleeved on the flexible plug unit.