Abstract: Aiming at the manufacturing technology requirements of thin-walled high-strength aluminum alloy shell products, the wire arc additive manufacturing (WAAM) process and mechanical properties of ZL205A aluminum alloy were studied.The results show that when the WAAM process of ZL205A aluminum alloy is as follows:the wire feeding speed is 6 -9 m/min, the welding speed is 0.01-0.02 m/s, and the voltage is 130%-140%, the ZL205A shell sample with good forming morphology and uniform internal structure can be obtained. The solid solution and aging heat treatment process is adopted, that is, the solid solution temperature is 540 ℃, the solid solution time is 600 min, the quenching temperature is 40 ℃, the aging temperature is 160 ℃, and the aging time is 240 min.The tensile strength of the sample is in the range of 444-455 MPa, and the elongation is in the range of 9%-10%, and the good comprehensive mechanical properties are obtained.