Explosion venting opening roof structure

The utility model relates to an explosion venting opening roof structure which comprises a cover plate installed above a concrete turning opening, a plurality of purlines are installed below the cover plate through explosion venting bolts, and the cover plate sequentially comprises a steel wire mesh, a vapor-proof film, a heat preservation layer, a waterproof breathable film, a profiled steel sheet and a PE coating from bottom to top. The purline is fixedly connected with the embedded steel plate in the concrete turned-over opening, a color steel plate is arranged on the periphery of the cover plate for corner wrapping, and a gap between the color steel plate and the concrete turned-over opening is filled with waterproof sealant. According to the explosion venting opening roof structure, the explosion venting opening roof structure and the peripheral waterproof method are refined, the pressure relief function requirement is met, meanwhile, the waterproof requirement is met, the manufacturing cost is low, inst