Air-conditioned passenger car fresh air device with check plate on air outlet

The invention relates to an air-conditioned passenger car fresh air device with a check plate on an air outlet, comprising an air window and an air window cover which are arranged on an air-conditioned passenger car roof; the opening direction of the air window cover opened by taking a hinged fulcrum shaft as an oscillation center faces to the head of the air-conditioned passenger car; the lower part of the hinged fulcrum shaft is connected with a heat exchange plate made of metal materials; the air window is divided into a fresh air window and an air exhaust window by the heat exchange plate; the fresh air window is internally provided with an air filter screen; the lower end and both side walls of the heat exchange plate are connected with a fresh air duct positioned at one side of the inner top surface of the air-conditioned passenger car roof; the fresh air outlet of the fresh air duct faces to the head direction of the air-conditioned passenger car; one side of the outer top surface of the air-conditione