Dam overflow weir top cover die

The utility model provides a dam overflow weir top cover die. Wherein the steel pipes and the steel formworks are arranged in a layered mode from top to bottom. The steel formwork is of a curved surface structure and is formed by splicing a plurality of unit formworks. Multiple pairs of first outer keel structures perpendicular to the steel pipe are arranged on the upper side of the steel pipe. The first outer keel structures are evenly distributed at intervals, each pair of first outer keel structures are spot-welded together in a back-to-back mode, each pair of first outer keel structures iswelded to the steel pipe, a plurality of second outer keel structures are arranged on the upper layer of each first outer keel structure and perpendicularly intersect with the first outer keel structure, and the second outer keel structures are evenly distributed at intervals and welded to the first outer keel structures. The utility model can effectively solve the problem that the falling and flatness of dam overflow su