A cable management assembly is applied to a first slide rail assembly and a second rail assembly. Each of the slide rail assemblies includes a first rail and a second rail movable relative to the first slide rail. The cable management assembly includes a cable management device and at least one supporting member. The cable management device includes a first arm and a second arm. The first arm is connected to the first rail of the first slide rail assembly. The second arm is pivoted to the first arm and connected to the second rail of the first slide rail assembly. The at least one supporting member includes a first end and a second end. The first end is pivoted to the first rail of the second slide rail assembly. The second end is detachably connected to the first rail of the first slide rail assembly.