The present invention provides an automatic surgical lighting device and its lighting method. The surgical lighting device is located to face a target area and includes a supporting element that is connected to at least a moving element that is above the target area. A lighting capture module set on the moving element is used to illuminate the target area and capture the image of the target area in order to send feedback signal. Both the lighting capture module and moving element are electronically connected to at least one control unit. The control unit, base on the feedback signal received, moves the lighting capture module via the moving element till the whole image of the target area is obtained. By this method, the surgery quality is improved, the surgery time is shortened and the risk of cross infection and the consequent litigation is lowered.