Preparation method of tungsten alloy

The invention relates to a preparation method of a tungsten alloy, which comprises the following steps: (1) selecting tungsten alloy powder, then laying the tungsten alloy powder on a substrate made of an indissolvable alloy material, and carrying out electron beam 3D printing preparation; and (2) a three-dimensional digital model of the tungsten alloy is imported, preheating parameters and entity filling scanning parameters are set according to structural data of the three-dimensional digital model and tungsten alloy powder parameters, and the tungsten alloy is obtained through electron beam 3D printing treatment. The proper tungsten alloy powder is selected, and the substrate made of a specific material is adopted, so that stable forming is guaranteed; and reasonable wire splicing strategy parameters are matched, the tungsten alloy cracking and warping phenomena can be restrained, meanwhile, the prepared tungsten alloy is high in forming efficiency and yield, and large-size and complex tungsten alloy compon