A swing-arm cable-management device (1, 1a, 1b, 1c, 1d) is provided and includes a mounting base (10), a first arm (20), a second arm (30), a guiding module (33), a sliding component (40, 40a, 40b) and a clamp component (60). The mounting base (10) is mounted on a charging
machine (9). The first arm (20) is pivotally connected to the mounting base (10) through a first pivot shaft (C1) perpendicular to the ground, and allowed to rotate relative to the mounting base (10). The second arm (30) is pivotally connected to the first arm (20) through a second pivot shaft (C2) perpendicular to the ground, and allowed to rotate relative to the first arm (20). The guiding module (33) is disposed on the second arm (30) and slopped to increase height along a horizontal direction from rear end to the front end. The sliding component (40, 40a, 40b) is slidably disposed on the guiding module (33). The clamp component (60) is connected to the sliding component (40, 40a, 40b) and fastens a charging cable (91), so as to manage the charging cable (91) effectively.