Abstract: To address the problems of coarse grain, porosity, low density, and poor mechanical properties of 7075 aluminum alloy prepared by conventional hot press sintering, this paper adopts the ultrasonic hot press sintering technology to prepare 7075 aluminum alloy, and investigates the effect of sintering temperature (450 ℃, 475 ℃, 500 ℃, 525 ℃) on its micromorphology and mechanical properties, and comparatively investigates the aluminum alloy sintered without ultrasound. The results show that with the increase of sintering temperature, the density, yield strength, tensile strength, and elongation of the material increase firstly and then decrease, and the optimum values are obtained at 500 ℃, which are (99.99±0.01) %, (153±5) Mpa, (245±10) MPa and (6.78±0.29) %, respectively, which are 1.09 %, 15.90%, 10.86 % and 60.28 % higher than that in the case of no ultrasonication, respectively. At ultrasonic hot pressing sintering temperature of 500 ℃, the material has large and deep tough nests with small grain size.