The invention relates to a cable connector assembly for the main board of a computer and belongs to the technical field of connector assemblies. According to the invention, the cable connector assembly for the main board of the computer comprises a flexible flat cable and an electrical connector matched with the flexible flat cable. The flexible flat cable comprises a plurality of conductors arranged at a specified interval and parallel to each other, and an insulating layer configured to cover the periphery of the plurality of conductor. The plurality of conductors and the n insulating layer form the main body of the cable. The outside of the main body of the cable is provided with an electromagnetic shielding layer and an insulating coverage layer that covers the periphery of the electromagnetic shielding layer. The electromagnetic shielding layer is composed of a copper foil layer and a conductive braid ply at the outer periphery of the copper foil layer. The cable connector assembly for the main board of the computer is simple in structure. The flexible flat cable is not only good in flexibility, but also improves the shielding performance. Therefore, the electromagnetic leakage is effectively prevented.