A hard alloy functionally graded material molding method, comprising: firstly, mixing an additive with an alloy raw material to obtain a mixture; then placing the mixture obtained from the above step into a composite die set for composite pressure molding, so as to obtain a blank; the composite die set comprise outer layer high-expansion coefficient dies, an intermediate transition layer die set, and inner layer low-expansion coefficient dies; and finally, sintering the above blank to obtain the hard alloy functionally graded composite material. The multi-component hard alloy functionally graded composite material which is large in size, has a complex outline structure and is free from obvious interfaces is prepared. In a thickness direction, the sintering molded functionally graded material attains gradient grain structures that have different components and different grain sizes and are free from obvious interfaces.