Provided is a steel plate hard mold for amorphous alloy coils. The steel plate hard mold for the amorphous alloy coils is composed of a rectangular mold cylinder and end plates at two ends of the rectangular mold cylinder. The rectangular mold cylinder is designed to be a steel plate rectangular cylinder corresponding to the amorphous alloy coils. The end plates are steel plates matched with the rectangular mold cylinder, a rotating shaft hole is formed in the middle of the end plates, and the end plates are welded at two ends of the rectangular mold cylinder respectively. The rectangular mold cylinder provided with the end plates in a welding mode is divided into two symmetrical portions which are provided with inclined surfaces matched mutually. In the process of winding of the coils, the two portions are combined together and used so that the steel plate hard mold for the amorphous alloy coils can be formed. The steel plate hard mold for the amorphous alloy coils is light in weight, low in cost, simple in structure and convenient to operate.