As-cast high-strength high-toughness die-casting aluminum-silicon alloy and preparation method thereof

The invention discloses an as-cast high-strength and high-toughness die-casting aluminum-silicon alloy and a preparation method thereof.The preparation method comprises the steps that an aluminum alloy ingot of an existing mark is adopted, molten aluminum is obtained through molten aluminum regeneration smelting, ADC12 aluminum ingots and A356 aluminum ingots in the molten aluminum are prepared according to the mass ratio of 1: 1, and an AlTi5B1 intermediate alloy and an Al-10Sr intermediate alloy are adopted for refining and modification treatment to generate the aluminum-silicon alloy; the generated aluminum-silicon alloy consists of the following elements in percentage by mass: 8.0%-10% of Si, 0.25%-0.45% of Mg, 0.6%-2.0% of Cu, 0.15%-0.3% of Mn, 0.4%-0.7% of Fe, 0.005%-0.015% of Sr, less than or equal to 0.5% of Zn, less than or equal to 0.3% of Ni, less than or equal to 0.1% of Ti, less than or equal to 0.1% of Cr, less than or equal to 0.002% of B, less than 0.3% of other impurities in total and the bal