The invention discloses a full-automatic tracking method for a digital X-ray fluoroscopic dose. The method comprises the steps that a first frame image is acquired, and a grayscale value and fluoroscopic parameters of the first frame image are collected and calculated; the grayscale value and the fluoroscopic parameters of the first frame image are adopted to calculate fluoroscopic parameters of acurrent second frame, and a grayscale value of the second frame is collected and calculated; the grayscale value and the fluoroscopic parameters of the current second frame image are utilized to calculate fluoroscopic parameters of the next frame, and a grayscale value of the next frame is collected and calculated; and the steps are sequentially circulated till fluoroscopy is over. In this way, equipment cost can be lowered, the situation that an artifact of a control circuit appears on an image can be avoided, and the quality of the fluoroscopic images is improved; and besides, the method ishigh in calculation speed and high in result precision and can shorten fluoroscopic time of a patent and lower the radiation dose of the patient.