The invention relates to a high-strength aluminum alloy used for a lithium ion battery shell and having excellent laser welding performance. The high-strength aluminum alloy comprises the components: 1.0-1.5 wt% of Mn, 0.2-1.0 wt% of Mg, 0.3-0.399 wt% of Cu, 0.251-0.4 wt% of Si, 0.2...