Adjusting mechanism capable of switching headrest and neck pillow by adjusting height

The utility model discloses an adjusting mechanism capable of switching a headrest and a neck pillow by adjusting height, which comprises a seat head, a pillow piece and an adjusting belt, a first fixing mechanism is arranged on the adjusting belt, a second fixing mechanism is arranged on the seat head, the adjusting belt is fixed on the seat head through the first fixing mechanism and the second fixing mechanism, and the adjusting belt is fixed on the seat head through the first fixing mechanism and the second fixing mechanism. A left binding belt and a right binding belt are arranged on the pillow part, a first adjusting part is arranged on the inner side of the pillow part, a second adjusting part is arranged on one side of the adjusting belt, and the first adjusting part and the second adjusting part can be mutually adjusted and adsorbed. The left binding belt and the right binding belt can be attached to the adjusting belt through the hook-and-loop fasteners, so that the height of the pillow piece on the