Airborne sampling system capable of automatically changing sampling system pressure and application thereof

The invention provides an airborne sampling system capable of automatically changing sampling system pressure and application thereof. The airborne sampling system comprises an airborne sampling head, a computer, a sampling main pipe, a pump and a pressure meter, wherein the airborne sampling head comprises a T pipe; the ends of the transverse orifices on both sides and the radial orifice in the T pipe are respectively an open structure; the internal diameter of the transverse orifice on one side is less than the internal diameter of the orifice on the other side, and the position in the orifice on the other side adjacent to the radial orifice is provided with a bulge; the radial orifice of the airborne sampling head, the sampling main pipe and the pump are sequentially connected; the pressure meter is arranged on the sampling main pipe; and the computer is respectively connected with the pump and pressure meter. The airborne sampling system capable of preventing moisture from condensation and reflux is used