The invention belongs to the technical field of metal materials, and in particular, relates to an extrusion cast aluminum alloy material and a preparation method thereof. The extrusion cast aluminum alloy material comprises the following elements in percentage by mass: 2.5-6.0% of Mg, 3.0-6.0% of Zn, 0.5-2.0% of Cu, 0.01-1.5% of rare earth element RE, 0.00005-0.2% of Ti, 0.00001-0.1% of B, 0-0.2%of Sr, 0-0.2% of Zr, the balance of Al, and impurities not more than 0.45%, wherein the rare earth element is one or combination of more in Ce, Y, La, Pr, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb and Lu. The aluminum alloy material is excellent in room-temperature comprehensive mechanical performance and casting performance.