The utility model relates to a full-automatic lifting hydraulic traction bed which comprises a bed body, a power part, a control part, a traction traveling mechanism, a front supporting box, a middle supporting box and a rear supporting box, wherein the three supporting boxes are respectively composed of a lifting hydraulic cylinder, a displacement sensor, a supporting plate and a spongy cushion; the front supporting box and the rear supporting box further respectively comprise a bridle; the front supporting box is mounted at the front end of a traction traveling frame; the middle supporting box is mounted at the rear end of the traction traveling frame; and the rear supporting box is mounted at the tail end of the bed body. During a traction treatment process, the lifted height of the three supporting boxes is fit for the normal physiological curvature of the spinal column of a human body; the traction is performed along the direction of the physiological curvature; the phenomenon of exacerbating the symptoms caused by the tension state of partial muscle of the patient due to the difference between the traction direction and the direction of the physiological curvature is avoided; and the treating effect is efficiently increased.