The invention discloses an adjusting method for the inclination of a roller of a building exterior wall decorative glass packaging machine. According to the method, adjusting mechanisms are symmetrically mounted at the two ends of the roller; two units, namely screw rods on supporting seats and advancing and retreating bolts on adjusting blocks are adjusted to change the contact surface of the roller and a packaging film according to the condition of the inclination of the packaging film so as to overcome the defect that one side of the pulled packaging film gets loosened and the other side ofthe pulled packaging film gets tensioned in the packaging process; the smooth wrinkle-free effect of the packaging film is achieved in the conveying process, so that the packaging film is closely attached to exterior wall decorative glass, the safety reliability and the packaging efficiency of glass packaging are guaranteed; the screw rods are rotated to rotate on the corresponding supporting seats in situ and are in screw-thread fit with the corresponding adjusting blocks to make the adjusting blocks move up and down rapidly; advancing and retreating adjusting mechanisms are controlled to make the roller move front and back rapidly. The adjustment timeliness is guaranteed. The situation that one side of the pulled packaging film gets loosened and the other side of the pulled packaging film gets tensioned is avoided.