The handmade sandwich panel of silica rock is made of double-sided color steel plate as the panel, filled with high-strength hydrophobic silica core material in the middle, and refined by hand. The product has the characteristics of fire resistance grade A non combustible, thermal insulation, high strength, and light weight. The core material has a closed cell rate of over 95% and excellent moisture resistance. Widely used in industrial plants with high cleanliness requirements such as electronics, medicine, and food, as well as in the construction field with strict standards for fire prevention and insulation.