The invention aims at providing a method for preparing a noncrystalline alloy stator core with low loss and regular and complete appearance which is applied to high-speed electrical machines. The preparation method comprises the following steps of incising noncrystalline alloy belt material to form a plurality of noncrystalline alloy sheets with preset length, laminating the noncrystalline alloy sheets to form laminated rods of the noncrystalline alloy sheets with preset thickness, annealing the laminated rods, soaking the annealed laminated rods in a binder, solidifying the laminated rods after being soaked, and cutting the laminated rods according to preset shape and size to form the stator core with needed shape and size. Therefore, the noncrystalline stator core can be prepared needing one-time final cutting only.