The invention belongs to the technical field of friction plates for vehicles and particularly relates to a weather-resistant high-metal friction plate for a military vehicle and a preparation method thereof. The weather-resistant high-metal friction plate for the military vehicle comprises raw materials including the following components of, by weight, 10-40% of iron-chromium-aluminum fibers, 7-30% of metal fibers, 7-21% of non-metal fibers, 5-15% of artificial graphene, 5-8% of resin, 2-5% of rubber and the balance calcium carbonate. The raw materials are weighed and mixed according to the designed ratio of all the components, the raw materials are subjected to hot-press forming, solidified and machined, and thus the weather-resistant high-metal friction plate is obtained. The weather-resistant high-metal friction plate is suitable for various harsh climates and environments and good in high-low temperature resistance and corrosion resistance, has the characteristics of high and stable friction coefficient and rapid and safe emergency braking, and is a high-performance special brake pad special for the military vehicle.