The utility model relates to a safe demolition unit, including gland, flange, fixed connection between gland and the flange, be provided with the rupture disk between gland and the flange, the rupture disk includes its border all around, press between gland and flange at the border, and its characteristics are the gland top is provided with the shielding plate, still be provided with between flange and the gland and slip through the net, slip through the net and press between flange and rupture disk, through double -screw bolt, nut fixed joint between gland and the flange, be connected through the connecting block between shielding plate and the flange, be provided with the clamping ring between rupture disk and the flange, the utility model provides a safe demolition unit, its characteristics are the utility model discloses on be provided with the shielding plate, can block the piece that the rupture disk blasting time is splashed away, prevent that the piece from leading to the fact the secondary accident, set up simultaneously on the flange towards inboard the slipping through the net of container, can stop inside the piece falls into the container, prevent that the piece from polluting the medium or stopping up the pipeline.