The invention discloses an iron-based amorphous thin ribbon, wherein the chemical component expression of the iron-based amorphous thin ribbon is FeaSibBcCdAle; the iron-based amorphous thin ribbon comprises the following components in percentage by atom number: more than or equal to 76 to less than or equal to 85 of a, more than or equal to 3 to less than or equal to 10 of b, more than or equal to 7 to less than or equal to 13 of c, more than or equal to 0.01 to less than or equal to 2 of d and more than or equal to 0.01 to 1 of e; a+b+c+d+e is equal to 100 in percentage by atom number; c+d is preferably between 10.5 and 14 in percentage by atom number, and c+e is preferably between 9.5 and 12.5 in percentage by atom number; the chemical component expression of the iron-based amorphous thin ribbon is preferably Fe80Si9B9C1.5A10.5 or Fe80Si9B10C0.5Al0.5; the saturation magnetic induction intensity Bs of the iron-based amorphous thin ribbon is not less than 1.5T; and the iron-based amorphous thin ribbon can show low yield strength, and can be folded 180 degrees but is not broken in the elastic deformation process. The invention has excellent soft magnetic properties and low manufacturing cost. The manufactured iron-based amorphous thin ribbon has good toughness and large width, can completely be used as the replacement material of the iron core of an intermediate frequency transformer and is suitable for large-scale manufacturing production.