Spiral self-centering drill rod fisher and control method thereof

The invention belongs to the technical field of drilling, and discloses a spiral self-centering drill rod fisher and a control method thereof. The spiral self-centering drill rod fisher comprises a die tap, a spiral steel claw fixing device and a spiral steel claw, wherein a turnbuckle in the same direction as the die tap is arranged at the bottom of the die tap, and the spiral steel claw sleeves the outer side of the die tap; and the spiral steel claw fixing device is arranged on the outer side of the upper end of the die tap, and the die tap and the spiral steel claw are connected together through the turnbuckle and the spiral steel claw fixing device. According to the spiral self-centering drill rod fisher, the die tap and the spiral steel claw are connected together through the turnbuckle and the spiral steel claw fixing device, so that the risk that the spiral steel claw falls off in the drill rod fishing process is effectively reduced; a blade angle is arranged on the inner side of the spiral steel claw