The invention discloses a tapered wedge base of an automobile upper die. The base comprises an installation baseplate, wherein two groups of T-shaped grooves are formed in the installation baseplate; a first connecting plate and a second connecting plate are disposed on two ends under the installation baseplate; an adjustment plate is installed between the first connecting plate and the second connecting plate; first guide rails are disposed on the sides of the first connecting plate and the second connecting plate close to the adjustment plate respectively; first slide blocks sleeve the first guide rails; a round hole is formed in the adjustment plate; a rotation shaft is in a sleeved connection inside the round hole; a first drive motor is installed on the end of the rotation shaft stretching from the upper part of the adjustment plate; a rotation plate is installed on the other end of the rotation shaft; and a blocking plate is installed under one end of the rotation plate. According to the invention, different dies are installed on the same upper die installation plate. Hence, adaptability of the tapered wedge base is enhanced; the dies with different sizes and models can be installed; investments in punching equipment are reduced; investments in processing cost are reduced; production efficiency is increased; the dies can be installed and replaced conveniently; time for die installation and debugging can be reduced; and product punching efficiency is increased.