The utility model relates to a pneumatic cylinder control technical field discloses a high precision displacement control pneumatic cylinder system, including controller, pneumatic cylinder, a displacement sensor and the 2nd displacement sensor, wherein, a displacement sensor and the 2nd displacement sensor all are used for detecting the displacement of the output pole of pneumatic cylinder, and just a displacement sensor's range is greater than the 2nd displacement sensor's range, the controller can be received primary feedback signal is selected to a displacement sensor, the 2nd displacement sensor's displacement feedback signal, the pneumatic cylinder action can be controlled to the controller. The utility model discloses when making the pneumatic cylinder have big stroke, still can increase substantially displacement control accuracy at little stroke within range, the processing of this kind of pneumatic cylinder system is simple easy to be realized, has widened the application of pneumatic cylinder, and the commonality is strong, but the wide application is in the hydraulic system of displacement control formulas such as fluid pressure type shaking table.