High-specific-modulus aluminum alloy plate and manufacturing method thereof

The invention discloses an aluminum alloy plate with high specific modulus, which contains Al and inevitable impurities, and further contains the following chemical elements in percentage by mass: 1.50 to 3.00 percent of Li, 0.60 to 0.80 percent of Mg, 0.30 to 0.40 percent of Si and 0.10 to 0.15 percent of Zr. Correspondingly, the invention further discloses a manufacturing method of the high-specific-modulus aluminum alloy plate, and the manufacturing method comprises the following steps: (1) smelting and casting raw materials by adopting a vacuum smelting furnace: in the smelting process, introducing inert gas into a melt for degassing and refining treatment, after refining is finished, standing at the temperature of 720-740 DEG C, and then casting and molding to obtain a cast ingot; (2) the cast ingot is directly heated and hot-rolled without being subjected to homogenization treatment after being subjected to surface milling; (3) single-stage solution treatment is carried out, and after solution treatment