A warm-pressing manufacturing method for high-strength aluminum alloy is characterized by comprising the following steps of weighing the certain amount of aluminum alloy powder or reinforcement element and aluminum alloy mixed powder through an electronic balance; adding the materials into a mould and pressing the materials into an initial blank through a pressing machine in the normal temperature condition; arranging the initial blank which is obtained through cold-pressing forming technique into the vacuum environment and warming the initial blank for 1 hour to 3 hours at the temperature of 250 DEG C to 350 DEG C under the pressure of 100MPa to 300MPa; inflating argon to serve as protective atmosphere and carrying out high-temperature sintering in the zero-pressure environment; and finally carrying out solid solution treatment and aging treatment on the materials which is sintered in high temperature and cooling the material to the room temperature to obtain the high-strength aluminum alloy. The warm-pressing manufacturing method is simple in producing process, short in producing cycle, high in material utilizing rate and low in cost. By means of cold-pressing forming, warm-pressing forming, atmosphere zero-pressure sintering and thermal treatment, the aluminum alloy which is even in tissue, high in compactness and good in mechanical property can be obtained.