Ventilation device and method for highway tunnel

The invention discloses a ventilation device and method for a highway tunnel, and belongs to the technical field of tunnel ventilation. A ventilation device for a highway tunnel comprises a fan shell, an air inlet and an air outlet are formed in the front side and the rear side of the fan shell correspondingly, a first air guide plate and a second air guide plate are arranged at the air inlet and the air outlet correspondingly, a first supporting plate is fixedly arranged on the inner wall of the fan shell, a positioning ring is connected to the first supporting plate, and a driving motor is fixedly arranged in the positioning ring; a suction mechanism for cleaning impurities outside the driving motor is arranged on the positioning ring, the output end of the driving motor is connected with a first rotating shaft, fan blades are arranged outside the first rotating shaft, and the end, away from the driving motor, of the first rotating shaft is fixedly connected with a first air guide plate; impurities adhered