Composition of air source treatment includes air filter, filter pressure regulator, oil lubricator. The air filter can efficiently separate water, oil and other impurities through a filter medium inside. It can automatically drain with the built-in pressure drainage device. The filter pressure regulator adopting the equilibrium structure, has the advantage of stable pressure, high precision, and sensitive reaction. oil lubricator, a product which can provide the pneumatic system with lubrication, has advanced structure and can conveniently adjust the amount of oil drops.