Commercial vehicle ventilation hood auxiliary detection tool

The utility model discloses an auxiliary detection tool for a ventilation hood of a commercial vehicle, which belongs to the technical field of ventilation hood detection and comprises a box body, a transparent window on a first side surface, an adapter plate on a second side surface, a connecting hole on a third side surface, a connector, a plug and a plug cover, the adapter plate is provided with a first mounting hole. The ventilation hood is mounted in the first mounting hole, the connecting hole is connected with the air pressure measuring device, the connector is connected with the fan, and the fan blows air into the box body, so that the ventilation performance of the ventilation hood can be conveniently detected; the connecting hole and the connector are plugged through the plug and the plug cover respectively, a rain test can be carried out, the internal condition of the box body can be observed through the transparent window, and detection operation is facilitated. The whole structure is simple and c