High-precision pneumatic control valve

The utility model relates to a high-precision pneumatic control valve which comprises a valve body, a valve element, a valve rod and a pneumatic actuator, the valve element is installed in the valve body, the bottom end of the valve rod is fixed on the valve element, the pneumatic actuator is in transmission connection with the valve rod, a through hole is formed in the bottom of the valve body and communicated with a water inlet cavity of the valve body, and an installation base is connected in the through hole through a bolt. A sliding hole is formed in the position, corresponding to the valve element, of the upper end face of the mounting base, a sliding rod is slidably connected into the sliding hole, the top end of the sliding rod is fixed to the valve element, a limiting ring is coaxially fixed to the side wall of the sliding rod, a mounting groove is formed in the side wall of the sliding hole, the limiting ring is slidably connected into the mounting groove, and auxiliary assemblies are symmetrically