Disclosed are a rotating mechanism, a support apparatus, and an electronic device. The rotating mechanism includes a base, a first door panel, a first connector, and a first swing arm. The first door panel is hinged to the base, the first connector is hinged to the first door panel. The base is further configured to connect a second housing. The first door panel is provided with a first guide sliding slot; and the first connector is provided with a second guide sliding slot. One end of the first swing arm is hinged to the base, the other end of the first swing arm is provided with a first sliding member, and the first sliding member is slidably connected inside the first guide sliding slot and the second guide sliding slot.