The invention relates to a low-creep aluminum alloy, which is prepared by a method comprising the following steps of (1) performing high-temperature oxidation treatment on inorganic nanometer powder,and then, plating the high-temperature oxidized inorganic nanometer powder with a metal layer to obtain the inorganic nanometer powder coated with a layer of metal; (2) putting the obtained inorganicnanometer powder coated with a layer of metal and pure aluminum powder in a vacuum ball mill for ball milling to obtain composite powder dispersed evenly; and (3) melting an aluminum alloy ingot to obtain an aluminum alloy melt; performing heat preservation at 700 DEG C to 900 DEG C; adding the composite powder obtained in the step (2), and stirring while the composite powder is added, and then, casting to obtain the low-creep aluminum alloy material. The aluminum provided by the invention has the property of low creep, and has a broad usage field.