Coal mine ventilation quantity detection device

The utility model provides a coal mine ventilation quantity detection device which comprises a ventilation roadway, a movable skylight is arranged at the air inlet end of the ventilation roadway, and the movable skylight is connected with the inner wall of the ventilation roadway in a sliding mode. A fan module is arranged in the ventilation roadway, the fan module comprises an axial flow fan and a first support, and the first support is used for fixing the axial flow fan; a detection module is arranged on the side, away from the movable skylight, of the fan module and comprises a detection shell and a wind bearing plate, the wind bearing plate is vertically arranged in the height direction of the ventilation roadway, one side of the wind bearing plate is movably connected with the first support, and a detection part is arranged on the surface of the other side of the wind bearing plate and extends into the detection shell. A pressure detection assembly is arranged in the detection shell and used for detectin