Rotating mechanism and foldable electronic device

A rotating mechanism, comprising a fixed base, a first synchronization swing arm, a second synchronization swing arm, and a synchronization gear, wherein the synchronization gear comprises a first gear, a second gear, and an intermediate gear, the first gear, the intermediate gear, and the second gear are all helical gears, the first gear, the intermediate gear, and the second gear are disposed side by side and in parallel, and the intermediate gear is located between the first gear and the second gear and engages with the first gear and the second gear;

• the first synchronization swing arm is fastened to the first gear, and the second synchronization swing arm is fastened to the second gear;
• and
• the synchronization gear is mounted in the fixed base and is rotatably connected to the fixed base, the first synchronization swing arm and the second synchronization swing arm are respectively located on two opposite sides of the fixed base in a width direction, a rotation direction of the first synchronization swing arm is opposite to a rotation direction of the second synchronization swing arm, and a rotation direction of the first gear is opposite to a rotation direction of the second gear.