Pneumatic quick coupling is a quick coupling mainly used for air piping and pneumatic tools. It can realise pipeline connection or disconnection without tools. When the ferrule of the mother body moves to the other end, the stainless steel ball automatically rolls outwards. The body is disconnected under the action of the common valve spring force of the parent body and the child body, and the valves of the child body and the parent body are closed separately, instantly blocking the flow of fluid.