Ventilation device for underground operation of coal mine and ventilation method thereof

The invention discloses a coal mine underground operation ventilation device and a ventilation method thereof, and relates to the technical field of coal mine underground ventilation, the coal mine underground operation ventilation device comprises an air draft pipeline, a ventilation pipeline, a communication pipeline and an air exhaust box, a first cover plate is arranged on the left side of an opening in the top face of the air exhaust box, and a second cover plate is arranged at the right end of the first cover plate; the first cover plate and the second cover plate are connected through an adjusting mechanism; a pair of cross plates is arranged in the middle of the interior of the ventilation pipeline, a fan shaft is arranged in the ventilation pipeline, the middle of the fan shaft sequentially penetrates through the middles of the pair of cross plates and is rotationally connected with the pair of cross plates, a plurality of fan blades are arranged at the two ends of the fan shaft, and a planetary mech