The invention provides an angle adjusting and controlling method and a display device automatically adjusting an angle. The device comprises a display, three wireless signal transceiving sensors which are respectively arranged on a first position, a second position and a third position of the display, a control device, and an angle adjusting mechanism used for responding to a control signal generated by the control device to adjust the angle of the display for a user. The angle adjusting and controlling method comprises the following steps: triggering the wireless signal transceiving sensors to respectively emit wireless signals; respectively calculating a first distance, a second distance and a third distance between the user and the first position, the second position and the third position of the display according to reflected wireless signals; and adjusting the angle of the display relative to the user according to distance difference values of the distances.