The invention discloses a forming method of amorphous alloy. The method includes: 1, under protection of inertial gas, heating an amorphous alloy ingot in a crucible in a vacuum chamber; 2, evacuating the vacuum chamber to obtain vacuum pressure of the vacuum chamber, being below 5000Pa, at the temperature lower than a melting point of the amorphous alloy ingot; 3, if the vacuum pressure is obtained in the step 2, continuing to heat the amorphous alloy ingot in the crucible until that the amorphous alloy ingot melts; 4, adding melt obtained in the step 3 under the vacuum condition, into a forming mold so as to obtain a formed amorphous alloy product. The forming method has the advantages that forming cycle can be shortened, production efficiency is improved and the formed amorphous alloy has good quality.