The invention relates to the field of bridge structures and construction, and provides an overpass, a pier and a special-shaped variable cross-section bent cap which aim at solving the problems of badstress performance, bad bearing capability and inconvenient construction of the pier in the prior art. The bottom center position of the special-shaped variable cross-section bent cap is supported bya pier stud and the special-shaped variable cross-section bent cap separately extends outward in the first direction to shape a bilateral cantilever body, and the first direction is the same as the width direction of a bridge body supported by the special-shaped variable cross-section bent cap; and in the first direction, the thickness of the special-shaped variable cross-section bent cap is gradually reduced from the middle to both sides. The overpass, the pier and the special-shaped variable cross-section bent cap have the beneficial effects of good stress performance, low material consumption, reasonable style design and low wind drag.