A method of forging aluminum/aluminum alloys includes: providing an aluminum/aluminum alloy billet; providing a forging die, the forging die including an upper die and a lower die, the upper die and the lower die being all mounted with heating element and temperature controller; locating the aluminum/aluminum alloy billet in the forging die; heating the upper die and the lower die and making the temperature difference between the upper die and the lower die be about 100° C.-350° C.; forging the aluminum/aluminum alloy billet to get an aluminum/aluminum alloy forged piece, the temperature difference between the upper die and the lower die being kept at about 100° C.-350° C. during the forging process; and opening the upper die and the lower die to remove out the aluminum/aluminum alloy forged piece.