An angle adjustment apparatus is provided, and includes a fastening component and an angle adjustment component rotatably connected to the fastening component. At least a part of the angle adjustment component is located in the fastening component, and the angle adjustment component can rotate in a horizontal direction and a vertical direction relative to the fastening component. In this way, angle adjustment efficiency is improved. In addition, a communication device can be prevented from being oblique after angle adjustment, thereby preventing a signal coverage function of the communication device from being affected.