Abstract: A supporting shelf includes a bearing seat, a first supporting arm, a second supporting arm, a third supporting arm and a setting seat. The bearing seat is pivotally connected with an end of the first supporting arm allowing the supporting shelf to swing left or right. An end of the second supporting arm is connected with another end of the first supporting arm through a pin-connected mechanism. An end of the third supporting arm is connected with another end of the second supporting arm. The setting seat is pivotally connected with a joint. The joint is pivotally connected with another end of the third supporting arm. The setting seat is for fixing a LCD moving up, down, left or right through the joint, whereby the length of the supporting shelf is increased, and the action area of the LCD is extended and is improved agility.