The current situation of coring drill pipe and friction welding technology is presented. Through the comparison of 3 kinds of deep hole wire-line coring drill pipe connection structure and production process, analysis was made on the advantages of the use of thin-wall wire-line coring drill pipe by friction welding in deep hole drilling. The paper introduces the structure design and the machining process of φ73mm×5mm thin-wall wire-line coring drill pipe by friction welding and puts forward the main technical problems and matters needing attention in the welding process. The main technical parameters of the drill pipe are obtained through the tension and torque tests, the maximum tensile force and torque are 580kN and 5500N·m respectively, and the recommended use depth is 2000～3000m.