The utility model discloses a curtain upper beam which comprises a beam body, a rolling cavity is formed in the beam body in a hollow mode, a penetrating groove communicated with the rolling cavity is formed in the bottom wall of the beam body in the length direction of the beam body, a dismounting groove communicated with the rolling cavity is formed in the top wall of the beam body in the length direction of the beam body, and the top wall of the beam body is covered with a sealing plate used for sealing the dismounting groove. Two sealing grooves are formed in the beam body in the length direction of the beam body, sealing lips are arranged at the positions, corresponding to the two sealing grooves, of the sealing plate, the sealing lips and the sealing grooves are arranged in an expansion fit mode, and the two sealing grooves are communicated to the two ends of the beam body to form sliding openings allowing the sealing lips to be placed into the sealing grooves. The beam body is provided with a loading piece used for applying acting force to the sealing lip so that the outer circumferential wall of the sealing lip can be tightly attached to the inner circumferential wall of the sealing groove. The curtain upper beam solves the problems that the sealing strength of a dismounting groove formed in the top of a traditional curtain upper beam is low, the sealing performance in the beam body is affected, and external impurities or water stains invade the beam body to affect components in the beam body.
