The utility model relates to the technical field of large-scale axial flow fan, and in particular relates to a large-scale axial flow impeller. The large-scale axial flow impeller comprises a hub, vane joints, and vanes, wherein the hub is composed of an upper disk, a lower disk, a shaft sleeve, shaft sleeve flanges, a mounting seat and fixing bolts, wherein the mounting seat comprises an upper mounting seat and a lower mounting seat; the lower end of the shaft sleeve is fixedly connected with the lower disk through the shaft sleeve flange; the upper end of the shaft sleeve is connected with the upper disk through the shaft sleeve flange; vane joint grooves are respectively and correspondingly formed at the centers of the lower mounting seat and the upper mounting seat; fixing bolt holes are formed on the mounting seat; and the upper disk and the lower disk are respectively provided with fastening through holes corresponding to the fixing bolt holes. The impeller is characterized in that mounting notches are formed between fastening through holes which are on the external circle of the upper disk and are adjacent to the mounting seat, the widths of the mounting notches are greater than that of the mounting seat, mounting bolt holes which are formed along the circumferential direction of the lower disk are respectively formed between adjacent two fixing bolt holes on the mounting seat, mounting through holes are correspondingly formed on the lower disk under the mounting bolt holes, and the mounting seat is fixedly connected with the lower disk in the manner that the mounting bolts penetrate through the mounting bolt holes. The impeller disclosed by the utility model has the advantages of simple structure, high bending strength, light weight, safety, reliability, low cost and the like, and is convenient to mount.