The pneumatic regulating ball valve is composed of pneumatic ball valve and valve electrical locator. It adjusts the opening of ball valve by inputting 4-20mA signal to the electrical locator to achieve proportional adjustment of medium flow, pressure, temperature, liquid level and other parameters. The valve core of the ball valve is a spherical body, through the axis of the circular hole, when the ball rotates 90 degrees, the sphere is presented at the inlet and outlet, thereby cutting off the fluid.