The invention relates to a method for producing a fender of a vehicle, belonging to the technical field of automotive outer decoration processing. According to the technical scheme provided by the invention, the method for producing a fender of a vehicle comprises the following steps: a, softening treatment, wherein a composite felt is baked and softened in an oven, the temperature of an upper heating area in the oven is between 300 and 360 DEG C, the temperature of a lower heating area in the oven is between 400 and 450 DEG C, and the composite felt is baked in the oven for 65 to 95 seconds; b, compact forming, wherein the softened composite felt is compacted into a semi-finished product, the time for compact forming is between 50 and 70 seconds, and the compact pressure is between 5 and 8 MPa; c, water-jet cutting, wherein the semi-finished product obtained in the step (b) is cut by water jet to obtain a required fender, wherein the cutting water pressure is between 40,000 and 50,000psi, and the cutting air pressure is between 0.6 and 0.8MPa; and (d), inspection, wherein the fender obtained in the step (c) is inspected, and is packaged into a carton and put in storage. The method is easy to operate, can produce the fender with high strength and light weight, and is economical and environment-friendly.