Drill rod positioning device of deep-hole drill rig

The utility model relates to a drill rod positioning device of a deep-hole drill rig. The device is characterized by comprising a fixing frame (1) fixed to a rod clamping device of the drill rod; the fixing frame (1) is provided with a cylindrical positioning device seat (2), and a through hole (3) is formed in the center of the cylindrical positioning device seat (2), is used for allowing the drill rod to penetrate to limit the drill rod and is provided with an inner sleeve (4) and an outer sleeve (5) inside; the outer sleeve (5) is adjacent to the inner wall of the positioning device seat (2), a clearance is formed between the outer sleeve (5) and the inner wall of the positioning device seat (2) and is provided with a bearing (6), a press cover (7) is fixed to the outer side of the positioning device seat (2) through a bolt, and a nylon ring (8) is fixed to the outer side of the press cover (7) through a bolt. The positioning device is capable of limiting the drill rod effectively, strong swinging of the drill rod is prevented during drilling, and the hole drilling efficiency is guaranteed.