Ventilation device for tunnel engineering

The utility model belongs to the technical field of tunnel construction, and particularly relates to a ventilation device for tunnel engineering, which comprises a fan shell, an arc-shaped shell is arranged at the top of the fan shell, a support is arranged at the bottom of the fan shell, two sets of auxiliary supports are arranged on two side edges of the support, and two sets of arc-shaped pieces are arranged at two ends of the fan shell. Two sets of second arc-shaped pieces are arranged at the two ends of the side, away from the fan shell, of the arc-shaped pieces, and the second arc-shapedpieces are rotationally connected with the arc-shaped pieces through connecting rotating shafts. A buckle is arranged at the end, away from the second arc-shaped piece, of the arc-shaped piece, and the top of the buckle is rotationally connected with the arc-shaped piece through a buckle rotating shaft. According to the utility model, through sliding between the sliding block and the sliding groove, the first filter scre