The invention relates to a preparation method for synchronously cold-rolling iron foil by using a laminated method. The method belongs to the technical field of rolling. The method comprises the following steps of: selecting a plurality of thick iron pieces and a plurality of thin iron pieces, wherein the thin iron pieces are clamped by the thick iron pieces to form a laminated structure; respectively carrying out heat treatment on each laminated layer of materials before rolling, and coating a lubricating material among laminations; and delivering the combination laminated structure to a common two-roller or four-roller rolling machine for cold-rolling and thinning, and thinning the thin iron pieces to iron foil with required thicknesses by selecting an appropriate reduction ratio and rolling passes. With the adoption of the preparation method for synchronously cold-rolling the iron foil by using the laminated method, the defects of low efficiency, large environment pollution, complex equipment, high cost, and the like of other preparation method are overcome, and the preparation method is suitable for preparing an extremely thin material of materials of pure iron, iron alloy and the like. The preparation method has the characteristics of being simple in process and convenient for operation. The prepared iron foil has high dimensional precision, good shape, and good flatness and surface quality. The preparation method has the characteristics of being high in efficiency, convenient, energy-saving, low in cost and the like and is suitable for industrial application.