The invention discloses a step recycling method for metallic aluminum in aluminum ash. The step recycling method includes steps of 1), sieving the aluminum ash to obtain oversize aluminum ash and undersize aluminum ash; 2), smashing the oversize aluminum ash obtained at the step 1), and then sieving the oversize aluminum ash to obtain metallic aluminum particles and undersize aluminum ash; 3), carrying out wet ball-milling on the undersize aluminum ash obtained at the steps 1) and 2) to obtain ball-milled slurry; 4), carrying out wet classification on the ball-milled slurry to obtain large-particle metallic aluminum sheets and fine-particle slurry; 5), sorting the fine-particle slurry to obtain fine-particle metallic aluminum powder and tailings; 6), dehydrating the tailings to obtain filter liquor and filter residues; 7), carrying out circulation enrichment the filter liquor and then evaporating the filter liquor to recycle industrial salt; 8), mounting ammonia gas collecting and absorbing devices above all materials exposed in the air in aluminum ash treatment procedures. The step recycling method has the advantages that step recycling is carried out on the metallic aluminum, accordingly, the metal recycling rate can be greatly increased, the purity of products can be greatly improved, and a novel way can be developed for harmlessly utilizing the aluminum ash as a resource.