Fluorine-lined ball valves are made of balls with round through-holes as opening and closing parts, and the balls rotate with the stem around the centerline of the valve body to realize the opening and closing of the valve. The special molding process is used to make the sealing surface dense and good, and the V-type PTFE packing combination makes the valve achieve zero leakage; The ball and the valve stem are cast as a whole, which eliminates the possibility of the valve stem rushing out of the pressure bearing part due to pressure changes, and fundamentally ensures the safety in use; It adopts all-plastic lining process, which is resistant to strong corrosion of media.