The utility model discloses a suspended ceiling unit and a suspended ceiling device used for a master-control room in a nuclear power station. The suspended ceiling unit comprises a reversed infundibulate suspended ceiling base, a light reflection layer is arranged on the inner wall of the suspended ceiling base, and an illuminant assembly giving out light in the direction facing the light reflection layer is arranged on the inner side of the bottom of the suspended ceiling base. The suspended ceiling device comprises a plurality of suspenders fixed on the roof vertically, the suspended ceiling units are fixed on the lower portions of the suspenders, the suspended ceiling units are distributed adjacently in a horizontal mode to close the whole roof of the master-control room, and a control mechanism used for controlling the illuminant assembly of each suspended ceiling unit is further included. The suspended ceiling unit is capable of guaranteeing illumination intensity and soft light without shadows. The suspended ceiling device is capable of meeting light requirements of each area, guaranteeing illumination intensity and avoiding light reflection, glaring and shadows.