A display angle adjustment system includes a display rotation module, an image capture module, a data processing module, and a control module. The display rotation module is configured for driving the display to move. The image capture module is rotatably positioned on the display. The data processing module is electrically connected to the image capture module, for receiving a signal including image information from the image capture module, and calculating an eigenvector using a plurality of feature points according to the signal. The control module is electrically connected to the display rotation module, the image capture module, and the data processing module, respectively, for controlling the display rotation module and the image capture module to rotate according to the eigenvector calculated by the data processing module.