The invention relates to a multivariate interalloy and a smelting method thereof. AI is taken as a base, other metals comprising Mn, Si, Fe, Ni, Co, Nb and Ti are added in certain ratio, and the AI and the added two or more metals form a ternary interalloy, a quaternary interalloy and a quinary interalloy. The interalloy and the method have the advantages that: 1, a stokehold material has stable chemical composition, the first time quality can reach 98 percent; 2, the cost is reduced, flash melt is realized, the time for liquid copper in a smelting furnace is shortened, metal oxide is reduced and the casting yield is improved; 3, the production period is quickened and the interalloy can be continuously produced; 4, the interalloy has short melting time, and the quinary interalloy AI-Fe-Co-Ni-Si is taken as an example, only thirty-five minutes is needed to melt one furnace of the quinary interalloy AI-Fe-Co-Ni-Si (400kg), while at least one hour is needed to melt Cu-Co, Cu-Ni and the like; and 5, when the interalloy is used, the alloy types are few, so the management is easy.