The utility model relates to the field of stamping dies mainly including automobile dies, in particular to a reverse tapered wedge mechanism. The reverse tapered wedge mechanism comprises a drive block, a master sliding block, a slave sliding block, a sliding block base, a pressing plate, a guide block and a V-shaped guide plate, wherein the master sliding block and the guide block are arranged at the bottom of the sliding block base, the drive block is fixed into the sliding block base, and the slave sliding block is arranged between the master sliding block and the guide block. The master sliding block and the slave sliding block are fixed into the sliding block base through the pressing plate, and the V-shaped guide plate is fixed to the upper end of the slave sliding block. The master sliding block horizontally slides relative to the sliding block base under the action of the drive block, and drives the slave sliding block to move upward in the inclined direction. The stamping direction and the stamping angle are changed according to the angle changes of the master sliding block, the slave sliding block, the pressing plate and the guide block, the blank in upward inclined stamping of stamping forming of a complex automobile stamping piece especially the upward inclined stamping ranging from 30 degrees to 90 degrees is filled, die forming procedures of the complex automobile stamping piece are reduced, die manufacturing cost is reduced, and the stamping efficiency of the complex automobile stamping piece is improved.