Abstract: The quick ball joint developed for portable sprinkler irrigation system which possesses the advantages of both ball joint and spigot joint. It's specially designed parking ring can perform functions such as water tight seal, automatic discharge and position fixing. The four-bar linkage is unique which can obtain a 30° left-right deflection. The quick joint, spherically structured, with aluminum cast, can be easily installed and detached. And it has good anticorrosion property and satisfactory adaptability to different terrain profiles.