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This invention relates to the field of inflatable equipment technology, and particularly to an air valve for manual mouth-blowing air intake and a garment with an inflatable collar using the same valve. The mouth-blowing air valve includes a first air exchange device, a second air exchange device, a regulating device, and a connecting assembly. The first air exchange device has at least two areas with different thicknesses. The second air exchange device has a shape that allows the first air exchange device to fit snugly against it. The area of ​​the second air exchange device that fits against the first air exchange device has a through-hole for ventilation. The regulating device is used to position the first air exchange device. The garment with an inflatable collar includes a garment body and a collar located at the neck of the garment body. The collar has an air bladder and a mouth-blowing air valve that works in conjunction with the air bladder. This invention is easy to operate, has a simple appearance, and is waterproof and dustproof in actual use, providing great convenience for daily life.