The outer layer of the fireproof bag is made of tightly woven and specially treated durable glass fiber cloth in a bag shape, and the interior is filled with special fire-resistant, thermal insulation materials and expansion materials. The fireproof bag has non flammability and a fire resistance limit of more than 4 hours. It expands and solidifies at higher temperatures. Form a heat-insulating and smoke proof seal, with good fire and moisture resistance, and free of toxic substances such as asbestos. The main technical performance has reached the advanced level of similar foreign products. The fireproof package can be effectively used for fireproof sealing at cable penetration holes in power plants, industrial and mining enterprises, high-rise buildings, petrochemicals, etc. It is particularly suitable for occasions where cables need to be replaced or added or removed frequently or for temporary fire prevention measures in construction projects.