Apparatus for machining variable trim line of panel

The present invention relates to an apparatus for machining a variable trim line of a panel, which can machine the variable trim line through a simple manipulation within a single process at the time of machining a trunk lid panel. The apparatus includes: an upper die unit disposed at an upper die steel and including a select retainer adapted to selectively punch the variable trim line of the panel, and an upper punch adapted to be moved forward and backward; and a lower die unit disposed at a lower die steel in such a fashion as to be directed opposite to the upper die unit in a row and adapted to push a strap caught in the lower die steel while cooperating with punching operation of the upper punch of the upper die unit. With the apparatus, a die manufacturing cost can be reduced, productivity can be increased and default rate can be reduced.