The invention relates to a Ni-Be containing high-strength heat-resistant aluminum alloy and a preparing method thereof, and belongs to the field of metal material projects. The aluminum alloy comprises the chemical ingredients including, by weight, 8.5%-9.5% of Si, 1.5%-1.7% of Cu, 0.6%-0.8% of Ni, 0.2%-0.3% of Mn, 0.1%-0.2% of Be and the balance Al and inevitable impurities. The preparing methodincludes the steps that (1) smelting is carried out, wherein cooling and heat preservation are carried out after smelting according to the set alloy ingredient weight proportion, slag scrapping is carried out, a coverage agent is added, an aluminum refining agent is added at two times, drossing is carried out, and fine molten metal is obtained; (2) pouring is carried out, wherein the molten metalobtained after refining is poured into a casting blank; and (3) heat treatment is carried out, wherein the casting blank is subject to solution treatment and aging treatment, air cooling to the room temperature is achieved, and the Ni-Be containing high-strength heat-resistant aluminum alloy is obtained. According to the Ni-Be containing high-strength heat-resistant aluminum alloy, the strength ofextension at the room temperature ranges from 391 MPa to 396 MPa, the elongation reaches 7.1%-7.3%, and the high-temperature tensile strength at 250 DEG C ranges from 265 MPa to 271 MPa.