An amorphous alloy and a method for preparing the amorphous alloy are provided. The amorphous alloy is represented by a formula of (Zr,Hf)aMbNcBed. M contains at least one element selected from transition group elements. N contains at least one selected from Al and Ti. And 40≦a≦70, 10≦b≦40, 5≦c≦20, 5≦d≦25, and a+b+c+d=100. The ratio of an atomic percentage of Hf to an atomic percentage of Zr is in a range of about 0.01 to about 5.