The invention discloses high-temperature-resistant large-contact-area two-layer composite fuel filter paper and a preparation method thereof. The high-temperature-resistant large-contact-area two-layer composite fuel filter paper is characterized by being prepared from, by weight, 2-5 parts of sodium carbonate, 10-20 parts of hardwood pulp fibers, 3-5 parts of polytetrafluoroethylene fibers, 10-20 parts of coniferous pine pulp fibers, 10-20 parts of polyester fibers, 1-3 parts of graphite, 10-20 parts of sepiolite nano fibers, 3-5 parts of Fe2O3, 5-10 parts of TiO2, 4-8 parts of MgO, 25-35 parts of a silane coupling agent KH560, 15-20 parts of polyoxyethylene aqueous solution, 2-4 parts of a titanate coupling agent, 50-60 parts of isopropyl alcohol, 5-10 parts of styrene-acrylic emulsion and appropriate amount of polyacrylate emulsion. By crumpling treatment of the filter paper, a contact area of fuel and the filter paper is increased, and accordingly filter efficiency is further improved. Due to addition of the polytetrafluoroethylene fibers, high temperature resistance of the fuel filter paper is improved.