Preparation method of high-manganese high-temperature vacuum alloy

The invention relates to the technical field of alloy materials, provides a preparation method of a high-manganese high-temperature vacuum alloy, and solves the technical problems of low yield and high processing difficulty of the existing high-manganese high-temperature vacuum alloy. The high-manganese high-temperature vacuum alloy is composed of, by mass, 40-46% of Mn, 10-15% of Ni and the balance Cu, and the preparation method of the alloy is characterized by comprising the following steps that S1, raw materials are weighed; s2, smelting; s3, casting is conducted; s4, turning and stripping; s5, cogging is conducted; s6, intermediate rolling; s7, finish rolling; wherein in the step S3, before casting, a mold is heated, so that the temperature difference between the mold and an alloy melt is smaller than 300 DEG C; in the step S7, the rolling deformation rate of each pass ranges from 20% to 25%, annealing is carried out after rolling of each pass, the annealing temperature is 760 DEG C, and the heat preserva