Suspended ceiling

The utility model discloses a suspended ceiling. The system comprises a conversion layer mechanism arranged on a roof, a plurality of hanging rods are uniformly arranged at the bottom of the conversion layer mechanism; a hollow plate and special keels located on the periphery of the hollow plate are arranged at the bottom of the hanging rod. A lamp is arranged above the hollow plate; a combined plate is arranged at the bottom of the special keel; the combined plate comprises a plurality of main plates which are evenly arranged at intervals and a plurality of auxiliary plates arranged between every two adjacent main plates. Wherein the main plate comprises a U-shaped batten with a U-shaped longitudinal section and outer flangings arranged at the tops of the two ends of the U-shaped batten,the auxiliary plate comprises a U-shaped hanging piece with a U-shaped longitudinal section and inner flangings arranged at the tops of the two ends of the U-shaped hanging piece and matched with theouter flangings, and the h