The invention relates to a drawer slide rail assembly. The drawer slide rail assembly comprises a first rail, a second rail, a drawer support and an adjusting device. The second rail can conduct longitudinally movable displacement relative to the first rail. The drawer support comprises a bearing piece and a drawer side wall connected to the bearing piece, and the bearing piece is installed on the second rail. The adjusting device is installed at the drawer side wall, and is used for adjusting the drawer support to lift and descend relative to the second rail. The drawer slide rail assembly comprises an adjusting device, and can conveniently adjust the drawer support relative to the upper and lower positions of the slide rail assembly.