Fireproof flame-retardant structure for constructional engineering

The utility model relates to the technical field of constructional engineering, in particular to a fireproof flame-retardant structure for constructional engineering, which comprises a ventilating duct, a shutter is fixedly mounted on one side of the ventilating duct, a baffle is movably connected to the top of the ventilating duct, and a weight block is fixedly connected to the top of the baffle. A supporting mechanism is movably connected to the interior of the ventilation pipeline, a triggering mechanism is movably connected to the top of the ventilation pipeline, and a plastic stick is arranged at the bottom of the triggering mechanism. Compared with the prior art, the fire protection device has the advantages that by arranging the baffle, when a fire happens to a building, the baffle falls down from the first inserting groove to block the ventilation pipeline, flames are prevented from spreading and diffusing along the ventilation pipeline, larger economic losses and even casualties caused by fire spread