Aluminum alloy plate strip and preparation method thereof

The invention relates to an aluminum alloy plate strip and a preparation method thereof. The method comprises the following steps: smelting an aluminum alloy raw material to obtain a molten aluminum alloy; the molten aluminum alloy is subjected to semi-continuous casting, and an aluminum alloy cast ingot is obtained; the aluminum alloy cast ingot is subjected to soaking treatment, and a homogenized aluminum alloy cast ingot is obtained; the homogenized aluminum alloy cast ingot is subjected to hot rolling, and a hot-rolled aluminum material is obtained; performing primary cold rolling on the hot-rolled aluminum material to obtain a first cold-rolled aluminum material; intermediate annealing is conducted on the first cold-rolled aluminum material, and a first annealed aluminum material is obtained; the first annealed aluminum material is subjected to secondary cold rolling, and a second cold-rolled aluminum material is obtained; the second cold-rolled aluminum material is subjected to final annealing, and a fi