The invention provides an aluminum alloy melting method. The aluminum alloy melting method is characterized by including step that aluminum alloy is processed through a refiner, and the refiner is an amorphous alloy made of components comprising, by weight, 40-60 parts of Zr, 25-45 parts of Cu, 1-15 parts of Al, 1-10 parts of Pd and 1-10 parts of Nb. Crystal grains can be well refined through the refiner, mechanical property of the alloy is improved to a certain degree, strength and plasticity of the alloy are improved, and the A356 alloy is quite applicable to manufacturing of automobile wheels after being refined.