The invention discloses a processing method of high-strength and density aluminum alloy sections. The processing method is characterized by comprising the steps of melting, casting and annealing an aluminum alloy ingot: putting an aluminum ingot in a smelting furnace, heating to melt, slagging off, adding manganese powder so as to melt, adding iron powder and copper powder so as to melt, and adding zirconium powder so as to melt, so that an aluminum alloy mixed solution is obtained; pouring into a mold so as to be cast, so that a semi-finished product is obtained; putting in an annealing furnace so as to anneal, so that the aluminum alloy ingot is obtained; spraying, curing and cooling: spraying alloy powder to the surface of the aluminum alloy ingot by adopting a spraying device, then putting in a high-temperature furnace so as to be heated, performing cooling protection with nitrogen, and immediately putting in water so as to be cooled to room temperature, so that a high-strength anddensity aluminum alloy ingot is obtained; fusing and casting the obtained aluminum alloy ingot into an aluminum alloy round bar, uniformly heating, then extruding at high temperature and high pressure so as to be processed into the aluminum alloy sections, performing forced-air hardening, stretching and straightening, performing saw cutting at a fixed length, heating to artificial aging insulation, and performing air cooling out of the furnace, so that the aluminum alloy sections are obtained.