The invention discloses a method for preparing ferro-nickel and aluminate cement admixture through converter slag. The problem about accumulation pollution of the converter slag of iron and steel enterprises is solved, meanwhile, the problem about utilization of red clay which is low in nickel content and very high in iron content is solved, the nickel resources are increased, the production costis reduced, and supports are provided for energy conservation, emission reduction and green development of the iron and steel enterprises.