High-temperature-resistant flame-retardant fabric and preparation method thereof

The invention discloses a high-temperature-resistant flame-retardant fabric which is prepared from the following components in parts by weight: 50-80 parts of unsaturated polyester resin, 15-30 parts of a nitrogen-phosphorus-silicon composite flame retardant, 2-10 parts of a compatilizer, 2-6 parts of a heat stabilizer, 1-5 parts of an antioxidant, 1-5 parts of bentonite and 1-5 parts of an ultraviolet absorbent, the preparation method of the nitrogen-phosphorus-silicon composite flame retardant comprises the following steps: weighing nano SiO2, adding toluene, carrying out ultrasonic dispersion to obtain a uniform suspension, adding vinyl trimethoxy silane, reacting while stirring, centrifuging, and drying to obtain modified nano SiO2; adding ethanol into the reaction container, then adding diethanol amine and the modified nano SiO2, washing reaction liquid after reaction, and carrying out reduced pressure distillation on an organic phase to obtain nitrided nano SiO2; 2-carboxyethyl phenyl phosphinic acid an