The utility model relates to a movable steel arch blank for crown brick masonry of a total-oxygen glass melting furnace. The movable steel arch blank for crown brick masonry of the total-oxygen glass melting furnace comprises an arc support of the arch blank, the arc support of the arch blank is made of channel steel, arch blank supports made of H-shaped steel are arranged below the arc support, a group of moving trolleys is arranged under the arch blank supports, the arc support, the arch blank supports and the moving trolleys are integrally welded, and adjusting jackscrews are welded on the arc supports. The movable steel arch blank meets requirements of a masonry tool for crown bricks excessively high in piece weight, and is low in deformation, and the radian of each crown brick can be adjusted. Besides, the movable steel arch blank is high in assembly speed and accurate in positioning, rework frequency is reduced, and work efficiency is improved.