An automatic adjustable display system and this adjusting method and device are provided to realize automatic adjustment of display system, so as to provide users with optimal viewing angle and viewing height. In the display system, an image acquiring unit is configured to acquire user images; a control unit is configured to receive and analyze the user images to determine user state information, and if the user state information meets a first preset condition, the control unit generates a first adjusting instruction for adjusting a distance between the display unit and the user and sends the first adjusting instruction to an implementing unit; the implementing unit is configured to receive the first adjusting instruction sent by the control unit and adjust the distance between the user and the display unit according to the first adjusting instruction.