Iron-based amorphous strip materials possess an ultrafine grain structure. These strip materials have an ultrafine grain structure, featuring extremely high saturation magnetic induction strength, along with high magnetic permeability, low coercivity, low loss (equivalent to 1/3 to 1/5 of silicon steel), constant magnetic permeability, low excitation current, and excellent temperature stability and aging stability. They can replace silicon steel, permalloy, and ferrite, and are widely used in electronic products with high precision and high stability requirements.