The invention discloses a soldering flux-free soldering aluminum alloy material and a preparation method thereof. The aluminum alloy material comprises a core layer, a soldering layer and a covering layer which are sequentially compounded, wherein the covering layer comprises the following components in percent by weight: less than or equal to 0.3 percent of Si, less than or equal to 0.3 percent of Fe and 0.05-0.3 percent of Bi or Sn, wherein aluminum is used as a base material, and the content of Si and Fe is less than or equal to 0.55 percent; the soldering layer comprises the following components in percent by weight: 5-15 percent of Si, 0.1-2 percent of Mg, 0.05-0.3 percent of Bi or Sn, less than 0.5 percent of Fe, 0.1-5 percent of Zn and 0.05-0.3 percent of rare earth; the core layer comprises the following components in percent by weight: 0.05-0.2 percent of Sm or RE and the balance being 3XXX in the terms of total weight of the core layer, wherein RE is selected from more than one of La, Ce, Nd, Er or Y. The soldering flux-free soldering aluminum alloy material has the advantages that the strength of a soldered joint is greatly improved, no solder skips and aggregation are caused, no black coating and corrosion of the surface of the soldered joint after being soldered are caused, namely, the soldered joint has good quality and high strength, so that the service life of a thermal transmission material is prolonged, meanwhile, the soldering success rate is increased, the number of scraped products is reduced, and correspondingly, the enterprise cost and the social cost are lowered.