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The automatic vertical drilling system (VDS) adopts downhole closed-loop control, through ground monitoring, a large closed-loop control on the ground and downhole is formed to keep the wellbore in a vertical position. The Mechanical Automatic Vertical Drilling System (MVDS) which working in full mechanical mode has been more economical, safety and reliability. We proposed and developed a novel MVDS with high control accuracy in this paper. A new type of Hydraulic Balance Turbine (HBT) is presented and applied to MVDS, used to drive the upper disc valve to reduce the frictional resistance and the influence of the bottom drilling tool vibration. This can achieve a “soft” connection between eccentric platform and the upper valves, eliminate the effect of the friction between the upper valve and the lower valve, and optimize the control ability. After HBT optimization, the stable angle is closer to the low side, which can make the control of MVDS more accurate. The same conclusion was verified by laboratory tests as well.