Subway channel natural ventilation quantity testing device and detection method

The invention discloses a subway channel natural ventilation quantity testing device and a detection method, and relates to the technical field of environment testing, the subway channel natural ventilation quantity testing device comprises a box body used for installing the whole device, the box body is provided with a controller, a liftable telescopic plate is arranged in the box body, the telescopic plate is set to be horizontal, and the controller is connected with the controller. The bottom of the telescopic plate is rotatably connected with a wind direction testing plate, the telescopic plate is provided with an electrically-controlled rotating detection block, the rotating detection block is provided with a detector used for detecting the wind direction, the box body is provided with a cleaning assembly used for cleaning water drops on the surface of the wind direction testing plate, the cleaning assembly comprises a cleaning plate, and the cleaning plate is slidably connected with the box body in the