The invention discloses a recovery method of aluminum in sludge from an aluminum profile factory. The method comprises steps as follows: sludge breakage, waste residue acidolysis, repeated filtration, impurity precipitation, washing, drying and the like, the recovery rate of the aluminum in the sludge is increased, filter residues produced in the recovery process can be used for preparation of bricks, cement and others in the architectural material industry, and the utilization rate of the sludge is further increased. Wastewater produced in the technological process can meet requirements for reuse of recycled water or can meet the drainage standard after slight treatment, and the method has the advantages of energy conservation and environmental protection. The technology adopts simple steps, resource recycling is realized, the operation cost of an enterprise is reduced, the phenomenon of environmental pollution caused by sludge huddling or backfilling in the aluminum profile factory is prevented, and remarkable economic and ecological effects are gained.