Pipeline connecting assembly, air conditioning system and vehicle

The utility model provides a pipeline connecting assembly, an air conditioning system and a vehicle. The pipeline connecting assembly comprises a pipe joint, a buckling and pressing sheath and a hose which are coaxially arranged. The pipe joint comprises an extending section and a connecting section which are connected in the axial direction, the hose sleeves the connecting section, and the buckling and pressing sheath is buckled and pressed on the peripheral wall of the hose; a sheath end wall is arranged at the end, close to the extending section, of the buckling and pressing sheath and extends from the inner circumferential wall of the buckling and pressing sheath to the connecting section in the radial direction. A sealing buckling part and a limiting buckling part are arranged on the peripheral wall of the buckling sheath, a limiting groove is further formed in the peripheral wall of the connecting section, the limiting buckling part and the limiting groove are oppositely arranged in the radial direction