Constructional engineering tunnel pipeline ventilation device

The invention relates to the technical field of constructional engineering, in particular to a constructional engineering tunnel pipeline ventilation device which comprises an outer cylinder and a fan fixedly mounted in the outer cylinder, and an activated carbon filter screen and a fixing ring are fixedly connected to the edges of the two sides of the inner wall of the outer cylinder correspondingly. On the basis that an air supply device is installed in an original tunnel, the air exhaust device capable of exhausting air in the tunnel outwards is additionally arranged, the air exhaust direction is upward, an exhaust opening is formed above the top of a tunnel opening, the air is not prone to being blown back by air facing the tunnel opening, dust and harmful gas in the exhausted air can be filtered separately, and the air exhaust efficiency is improved. The influence on external air quality is avoided, and the discharge efficiency of harmful gas and dust is improved. Dust can be collected under the conditio