The invention discloses an extrusion-formed Al-Fe-Cu alloy and a preparation method thereof and belongs to the field of aluminium alloy heat treatment. The extrusion-formed Al-Fe-Cu alloy comprises, by mass, 3.0%-6.0% of Fe, 2.0%-5.0% of Cu, 0.5%-2.0% of Zn, 0.2%-0.5% of Mn, 0.3%-1.5% of Mg and the balance Al and inevitable impurities. The preparation method comprises the steps that (1) dosing is conducted according to the composition proportion of the extrusion-formed Al-Fe-Cu alloy, and smelting is conducted to obtain an Al-Fe-Cu alloy ingot; (2) the alloy ingot is preheated at a certain temperature; (3) the alloy ingot is extruded to obtain an Al-Fe-Cu alloy bar, and reeling is conducted after cooling; (4) the alloy bar is subjected to solution treatment, and then warm water quenching is conducted; and (5) artificial aging treatment is conducted, air cooling is conducted to achieve the indoor temperature, and the extrusion-formed Al-Fe-Cu alloy is obtained. The microscopic structure of the alloy is improved obviously, the tensile strength is 184-245 Mpa, and the Brinell hardness is 63-70 HB; the heat treatment technology process is simplified, the preparation method saves energy, and the production cost is reduced.