SRC rotating clamping pneumatic air cylinder is an indispensable clamping element for CNC machine tools, especially for machining centers to comprehensively improve work efficiency. It is small in size, power, save space, fast clamping speed, positioning, basically can be regarded as a fixture manipulator. Quick clamping and quick opening of workpiece on the machine tool is suitable for the occasions with fast production rhythm and high requirement on workpiece processing accuracy.