A supporting device for supporting a display is provided. The supporting device includes an upright, a bearing slider, an actuating module, a driving module, and a control module. The upright includes a column body and a receiving space. The bearing slider is slidably disposed in the receiving space. The actuating module includes a screw rod and a screwing element, the screw rod is pivoted to the upright along a first axis and inserted to the screwing element, and the screwing element is disposed on the bearing slider and screws with the screw rod. The driving module is connected to the actuating module and drives the screw rod to rotate about the first axis. The control module controls the driving module to drive the screw rod to rotate to make the screwing element and the bearing slider move between a highest position and a lowest position along the first axis.