A waterproof button structure applied to a wearable device having a button hole, including an installation sleeve, a button and a first sealing ring. The installation sleeve passes through the button hole and has a through hole. The button passes through the through hole and can move along an axial direction of through hole or rotate relative to the installation sleeve. An outer wall of button is provided with a first conical surface along a circumferential direction of button. An outer circumferential wall of first sealing ring is connected to a hole wall of through hole. The first sealing ring is sleeve on a periphery of button. An inner wall of first sealing ring is provided with a second conical surface along a circumferential direction of first sealing ring. The second conical surface and the first conical surface are at least partially abutted against and limited by each other.