Combined ceiling

The utility model relates to the technical field of indoor decoration, in particular to a combined ceiling and suspended ceiling joist which is a part connected with a roof, a sliding groove, a transverse fixing plate and a vertical fixing plate are arranged at the bottom of the combined ceiling and suspended ceiling joist, and the combined ceiling and suspended ceiling joist is arranged at the tops of a conventional plate and a maintenance plate. The suspended ceiling joist laying device overcomes the defects in the prior art, by arranging the sliding grooves, the vertical fixing plates and the pull rods, after suspended ceiling joists are laid at equal intervals, a worker pulls the pull rods straight from the interiors of the pull rod grooves, the pull rods can be clamped by two hands conveniently, and then the conventional vertical fixing plates are clamped in the sliding grooves; the connection relation of two adjacent conventional plates or maintenance plates can be stabilized through the fixing grooves