A cable management assembly includes a cable management arm and a cable management device. The cable management arm is arranged with a mounting hole and a positioning hole. The mounting hole includes a first hole portion and a second hole portion. The cable management device is detachably mounted to the cable management arm and includes a mounting portion and an elastic portion. Wherein the mounting portion of the cable management device is capable of entering the second hole portion from the first hole portion of the mounting hole, and the mounting portion is blocked by a blocking section adjacent to the second hole portion. The elastic portion of the cable management device is configured to enter the positioning hole to be blocked by at least one blocking wall of the cable management arm.