Light steel keel curtain box

The utility model relates to a light steel keel curtain box which comprises a main keel, an auxiliary keel, a side keel, a first frame, a second frame, a flame-retardant plate and a decorative plate. The main keels are horizontally arranged and hoisted on a roof top plate, a horizontal first frame is arranged below the main keels, a plurality of auxiliary keels are arranged in the first frame at intervals, and the auxiliary keels are installed on the main keels; a second frame is tightly attached to the side face of the first frame and vertically fixed to a roof top plate, and a plurality of side keels are fixed in the second frame at intervals. The lower side of the second frame is located below the plane where the first frame is located, so that a concave curtain groove is formed below the first frame. A flame-retardant plate is fixed to the lower end face of the first frame, a decorative plate is fixed to the lower end face of the flame-retardant plate, and a decorative plate is fixed to the exposed face o