The invention discloses a large-span roof steel truss structure and an accumulative slipping construction technology. A single arch truss is spliced by three sections of trusses, and a steel pulling cable is arranged at the bottom chord of the arch truss; with the adoption of support jig frames, multiple sections of large-span trusses are subjected to sectioned hoisting and airborne assembling; with the adoption of the mode that long guide rails are arranged on parapet walls and short guide rails arranged on the support jig frames, a multi-point advancing scheme of arranging slipping equipment at multiple points is implemented; by means of addition of bracket slipping shoes, a working plane where the trusses are located is separated from a working plane of guide rail slipping, so that the problem of construction difficulty of mounting the steel pulling cable firstly and slipping the trusses later is solved, the mounting method of the airborne assembling of the multiple sections of large-span trusses and overall slipping of the multiple trusses is realized, and the structure and the construction technology have the advantages that the construction cost is reduced, the construction efficiency is improved and the construction is safe and reliable.