A falling blanking die for an aluminum alloy plate comprises an upper die base, a lower die base, an upper convex die, a lower concave die and a base. Guide mounting holes are symmetrically machined in the upper die base relative to the axis, and an upper convex die guide hole is machined with the axis of the upper die base as the center. Guide columns are symmetrically arranged on the lower die base relative to the axis. A lower concave die mounting hole is machined with the axis of the lower die as the center. The upper convex die is divided into two parts from top to bottom, the upper part is a connecting rod, and a connecting hole is formed in the upper end of the connecting rod and used for being connected with an execution mechanism of a blanking machine; and the lower part is an upward convex model and used for machining corresponding shapes. The lower concave die is divided into two parts from inside to outside, wherein the relatively inner part is a through hole type downward concave model, and the relatively outer part is a solid outer connecting ring. Stepped mounting surfaces are arranged at the upper end and the lower end of the outer connecting ring. Threaded mounting holes are formed in the stepped mounting surfaces. A lower die base mounting hole is formed in the base.