Air inlet of vehicle air conditioner, vehicle comprising air inlet and air conditioning system

The invention relates to a vehicle air conditioner air inlet which comprises an air door frame which is a channel for a vehicle air conditioner to enter fresh air and is defined by side walls with rectangular cross sections, and the channel of the air door frame is provided with a fresh air inlet end and an air inlet end of the vehicle air conditioner; the air door is rectangular and arranged in a channel of the air door frame, protruding air door shafts are arranged in the centers of the two ends of the rectangular air door, air door shaft grooves are reserved in the corresponding side walls of the air door frame, the air door is movably connected with the air door frame through matching of the air door shafts and the air door shaft grooves, and closing limiting points and closing clamping points are arranged on the side walls, perpendicular to the air door shafts, of the air door frame. And when one side of the air door rotates to the closing limiting point, the other side of the air door crosses the closin