This application relates to a hook mechanism, a support apparatus, and an electronic device. The hook mechanism includes a shaft cover, a base, and swing arms, and a plurality of first mounting parts are disposed in the shaft cover. The base is fixedly disposed in the shaft cover. The swing arms are disposed at two ends of the shaft cover along a first direction, and a second mounting part is disposed on the swing arm. The swing arm is rotatably connected to the base, so that the swing arm can rotate between an unfolded location and a folded location; and when the swing arms are in the unfolded location, the first mounting part is separated from a corresponding second mounting part; or when the swing arms are in the folded location, the first mounting part is mounted to the corresponding second mounting part.