High-strength flame-retardant thermal-insulation composite board

The utility model discloses a high-strength flame-retardant thermal-insulation composite board, which comprises a panel, a first panel and a second panel, which are opposite to each other along the thickness direction of the composite board; the core layer is clamped between the first panel and the second panel; the core layer comprises a phenolic foam layer and a glass fiber reinforced layer, the glass fiber reinforced layer comprises a plurality of glass fiber reinforced unit layers, and each of the plurality of glass fiber reinforced unit layers comprises a first section glass fiber layer and a second section glass fiber layer; the first section of glass fiber layer is arranged on the phenolic foam layer along the spreading direction of the composite board; and the second section of glass fiber layer is arranged in the phenolic foam layer in a penetrating manner along the thickness direction of the composite board. The high-strength flame-retardant heat-preservation composite board is reasonable in structu