The tungsten-molybdenum alloy is an alloy containing two elements of molybdenum and tungsten, and includes a molybdenum-based molybdenum-tungsten alloy and a tungsten-based tungsten-molybdenum alloy series. The alloy can be formed in any ratio and is a complete solid solution alloy at all temperatures. The preparation method of the tungsten-molybdenum alloy is the same as the