Provided are an F-shaped hanging piece and a suspended ceiling system employing the same. A head-turning plate on the upper end of the F-shaped hanging piece bends at a 90 degree angle towards a plate body, and the abdominal part of the plate body in a long strip shape has a profile steel penetrating port. The suspended ceiling system comprises original structure suspended ceiling profile steels, conversion layer suspended ceiling profile steels, main keels connected with the decorative plates and suspension rods used for connecting the conversion layer suspended ceiling profile steels with the main keels. According to the suspended ceiling system, the conversion layer suspended ceiling profile steels are connected with the original structure suspended ceiling profile steels through the F-shaped hanging pieces. The F-shaped hanging piece is simple in structure, is convenient to manufacture, and can be used conveniently and efficiently. The suspended ceiling system is installed in a top-down manner without additional erection of a scaffold, thereby avoiding disadvantages caused by high altitude working in an installation process. In addition, the hanging piece is used for the connection between suspended steel keels and the conversion layer suspended ceiling profile steels, and therefore, the suspended ceiling system is quick in installation, easy to adjust, and convenient to dismount. The structure of the suspended steel keel is prevented from being damaged, and a high safety coefficient is ensured. The F-shaped hanging piece and the suspended ceiling system can be widely applied to large-area suspended ceiling technique.