Ventilation device for building technology design

The utility model discloses a ventilation device for building technology design, and relates to the technical field of ventilation devices, the ventilation device comprises a wall body, a ventilation pipeline, a ventilation fan and a motor, a clamping block on the ventilation pipeline is clamped with a first installation block, a pull rod is installed on the first installation block, and a reset spring and a spring pressing plate are arranged on the pull rod; a second mounting block and a third mounting block are fixed to the outer side of the wall, a first screw is mounted on the second mounting block, the ventilation device for the building technology design is provided with an automatic cleaning mechanism, a motor is started, a rotating roller and a ventilation fan are driven to rotate for ventilation, the rotating roller drives a brush and a scraper to rotate, the brush cleans the inner wall of a ventilation pipeline, and the inner wall of the ventilation pipeline is cleaned through the scraper. The scrap