The present invention provides a common fender mounting jig apparatus for use with multifarious vehicles including a plurality of common clamping units for clamping fender panels of multifarious vehicles by using, selectively, a plurality of fixing blocks processed in compliance with the shape of a fender panel associated with each vehicle model. Additionally, the common fender mounting jig may also include a clamp movement unit for moving the common clamping unit upwardly and downwardly, forwardly and backwardly; a fender mounting jig mounted on its upper face with the common clamping unit and loading the fender panel clamped by the common clamping unit on a body-in-white; and a jig movement unit for moving and rotating the fender mounting jig. By using only one common clamping unit, the present invention is able to comply with various shapes of fender panels of multifarious vehicles.