The invention relates to a small welding wire reel device and a using method of the small welding wire reel device and belongs to the field of welding of tube heads and tube plates of heat exchangersin the mechanical manufacturing industry. The small welding wire reel device and the using method are used for solving the problems about the stability of a current automatic TIG welding machine and the reasonable configuration of a whole welding wire reel. The small welding wire reel device structurally comprises a small welding wire reel 1, a fixed shaft 2, a bracket 3, a positioning nut 4 and arocker arm 5. The bracket 3 is in an L shape, the fixed shaft 2 is welded to the vertical surface of the bracket, and a bolt hole is formed in the horizontal surface of the bracket. The small weldingwire reel 1 is mounted on the fixed shaft 2, can be rotated by the rocker arm 5 and is limited by the positioning nut 4. In use, the horizontal surface of the bracket 3 is fastened to a welder frame8 by a connecting bolt 6 and a nut 7, and the rocker arm 5 is rotated clockwise to evenly wind a fine welding wire around the small welding wire reel 1. The small welding wire reel device and the using method have the beneficial effects that the structure is simple, the operation is convenient and fast, the bearing capacity of the welder crossed frame is reduced, the optimal arrangement of the welding wire resources is realized, and the welding quality and efficiency of the tube heads and the tube plates are improved effectively.