The invention discloses a welding process of an integrated type drill rod for a blast furnace. The welding process of the integrated type drill rod for the blast furnace is used for welding of a drillbit, a drill rod and a drill rig tail. The welding process of the integrated type drill rod for the blast furnace incudes steps: performing integral heat treatment on the drill bit, the drill rod andthe drill rig tail, performing polishing treatment on welded parts, preheating the welded parts under 300-400 DEG C, using an electric welding rod for starting to perform vertical welding from the bottom of a butting surface along the circumferential direction of the drill rod from inside to outside, using the electric welding rod for starting to perform horizontal welding along the length direction of the drill rod when welding to one half of the depth of a welded junction, and forming half-arc-shaped welding faces; performing heat preservation and cooling on the welded parts; and performingshot blasting on the welded parts. The welding process of the integrated type drill rod for the blast furnace welds the drill rod, the drill head and the drill rig tail into a whole, reduces the number of assembling accessories, and avoids the problem that threaded parts are easy to crack; and due to optimized combination of the welding process, fatigue strength of the welded parts of the drill rod is improved, use life of the welded parts of the drill rod is prolonged, the purpose that an iron notch drilling tool can be repeatedly used is realized, work efficiency is improved, and productioncost is reduced.