An apparatus for assembling a fender panel of a vehicle, including a single-type bracket may have a horizontal assembly surface at an upper end portion thereof, and an assembly end having a fender panel assembly aperture at a lower end portion thereof extending from the horizontal assembly surface toward a front side of the vehicle, wherein the assembly end of the single-type bracket may be mounted on a front end portion of a fender panel located between a front end module and a bumper cover, and wherein the horizontal assembly surface may be fixed to a lower end portion of a fender apron upper member.