Ventilation device for building design

The utility model relates to a ventilation device, in particular to a ventilation device for building design, which is attractive in appearance, good in protection performance and capable of discharging indoor dust. Comprising a wall body and an axial flow fan, a through hole is formed in the wall body, the axial flow fan is arranged in the through hole, a connecting cylinder is arranged in the through hole, the axial flow fan is arranged in the connecting cylinder, an outer movable cylinder is arranged on the side, close to the outside of the wall, of the connecting cylinder, an inner movable cylinder is arranged on the side, close to the inner wall, of the connecting cylinder, and a filter is arranged at one end of the outer movable cylinder; a first through opening is formed in the outer movable barrel, a decorative plate is arranged at one end of the inner movable barrel, a second through opening is formed in the inner movable barrel, frame bodies are arranged on the two sides of the axial flow fan, push