Abstract: To address the problems of large length-diameter ratio, poor stiffness, susceptibility to deviation, and difficulties in observation and correction in deep hole machining tool systems, a method utilizing cutting fluid hydraulic pressure for centering and deviation correction is proposed. Based on the wedge effect of the cutting fluid and the principle of enhancing dynamic pressure through spiral grooves, a centering device connected to the original drill bit and drill pipe via threads is designed, leveraging the pumping and step effects of the spiral grooves. By comparing and analyzing the dynamic pressure distribution of the oil film between the centerer and the ordinary drill pipe, the centering and deviation correction effects of the device are studied, and the spiral structure parameters of the centering device are optimized. The results show that compared with conventional drill pipes, the centering device can significantly increase the oil film dynamic pressure in deep hole processing, achieving the objectives of centering and deviation correction and enhancing the stability of deep hole tools during the machining process.