The invention discloses a high-strength aluminum profile for an electronic product outer part and a preparation method of the high-strength aluminum profile. The aluminum profile comprises the following components: 1.0-1.1% of Mg, 0.9-1.0% of Si, 0.6-0.7% of Cu, 0.2-0.3% of Mn, 0.005-0.01% of Ti, less than or equal to 0.1% of Fe and the balance of Al and inevitable impurities. The preparation method sequentially comprises the following steps: burdening, melting aluminum
alloy liquid, detecting and adjusting components, blowing and refining in a furnace, refining grains, degassing and filtering, carrying out oil-gas sliding
casting, homogenizing at high temperature, heating at gradient temperature, carrying out isothermal
extrusion, stretching and straightening, sawing, framing and carrying out aging treatment. Through deep refining purification and large-
extrusion-ratio isothermal
extrusion, the cleanliness of the aluminum profile is improved, a completely recrystallized
fine grain structure is obtained, the aluminum profile has high strength, high
plasticity and excellent oxidation coloring performance, the tensile strength is larger than 450 MPa, the yield strength is larger than 410 MPa, the percentage elongation after fracture is larger than 10%, the 60-degree specular glossiness value of an oxidation film is larger than 150, and the aluminum profile is suitable for large-scale production. And the development requirements of larger, thinner, lighter and more beautiful electronic products such as smart phones, tablet personal computers, notebook computers and the like are met.