<p>A novel 7075/5356 aluminum alloy laminated composite was fabricated by alternately depositing a 7075 wire and a 5356 wire layer-by-layer using wire arc additive manufacturing (WAAM) process. The microstructure, mechanical properties, and fracture mechanism of the produced components under as-deposited and heat-treated conditions were systematically investigated. Results demonstrated that there was an interlayer formed between the 7075 layer and 5356 layer, which shows gradient changes in the number of second phases and microhardness. In comparison with single 7075 aluminum alloy components, the heat-treated 7075/5356 aluminum alloy laminated composite exhibited superior comprehensive mechanical properties. The elongation was 103.8%, 50.7% higher in vertical and horizontal directions, while the tensile strength was only 18.4% and 14.3% lower, respectively. The fracture modes of 7075 layer and 5356 layer show differences, which were intergranular fracture and intergranular-transgranular mixed fracture, respectively.</p>