This utility model discloses an adjustable synchronization component, a synchronization beam, and a sunshade, including a synchronization belt and two synchronization pulleys. The synchronization pulleys are installed at both ends of the oval-shaped synchronization belt. An adjustment mechanism is installed on the synchronization belt and close to one of the synchronization pulleys. The adjustment mechanism includes a guide and an adjustment component. The adjustment component controls the tension of the synchronization belt, and the guide is used to limit the movement direction of the adjustment component. By changing the elastic tension of the synchronization belt to a threaded tension, the tension effect is more stable, effectively preventing the synchronization belt from skipping teeth, and the guide is provided to ensure that the adjustment direction does not deviate.