The invention discloses a sand-glass-shaped metal graded construction forming method. The sand-glass-shaped metal graded construction forming method is characterized in that firstly, a conventional construction method is used for carrying out first-stage construction, a workblank is obtained, and is subject to further forging to form a round table shape or square table shape to serve as a workblank element of the next-stage construction; N-stage construction is carried out, and two workblank elements are stacked together to form a sand glass shape on the whole body; the two workblank elementsstacked to be in the sand glass shape are packaged to a sand-glass-shaped prefabricated blank; through forging welding, the interface between the two workblank elements is welded to make the sand-glass-shaped prefabricated blank being the workblank; the workblank is further forged to form the round table or square table shape to serve as an N+1 stage constructed workblank element; the above stepsare repeated so as to achieve multi-stage construction, and the larger workblank is made. Due to the fact that the middle of the sand glass shape is small, the upper end and the lower end are large insize, in the deformation process, the middle segment with the small size preferably deforms, and therefore under the small pressure, large deformation of the middle interface is achieved.