Preparation method of aluminum alloy material for semi-solid die casting of 5G cooling shell

The invention relates to a preparation method of an aluminum alloy material for semisolid die casting of a 5G cooling shell. The preparation method comprises the following step I of collecting A356 aluminum alloy waste; and the step II of melting the A356 aluminum alloy waste collected in the step I in a smelting furnace, sampling and measuring the initial concentration of Sr in secondary aluminum; the step III of calculating the flux adding amount according to the initial concentration of the Sr, wherein the flux components comprise NaCl, KCl and AlF3; the step IV of putting the flux into a powder spraying tank according to the flux adding amount calculated in the step III, and completely spraying flux particles into the bottom of an aluminum melt by taking nitrogen as a carrier; the step V of letting the aluminum melt stand, and meanwhile removing dross on the surface of the aluminum melt; and the step VI of sampling and measuring the residual concentration of the Sr until the residual concentration of the Sr reaches a preset target, removing the Sr, and pouring into an aluminum ingot for later use. According to the method, materials with wide sources are utilized to regenerate and manufacture products with large market gaps, and the market competitiveness and commercial value of the preparation method are improved.