Environment-friendly ventilation device for building construction

The environment-friendly ventilation device for building construction comprises a ventilation pipe, an exhaust fan is installed at one end of the interior of the ventilation pipe, fixing rods are welded to the positions, located on the two sides of the bottom end of a filter screen, of the bottom end of the ventilation pipe, a collecting frame is installed between the two fixing rods, and a rubber frame adheres to the top face of the collecting frame. The middle of the bottom face of the fixing rod is connected with a fixing screw rod through threads, a rotating shaft is movably installed at one end of the interior of the collecting frame, the outer side of the rotating shaft is fixedly connected with a rotating frame in a sleeved mode, springs are evenly welded to the interior of the rotating frame, and a movable plate is welded to one end of each spring. And dust in the collecting frame can be compressed, so that more dust can be collected in the collecting frame, workers do not need to frequently clean the