The invention relates to a corrosion protection technology of attended high-strength steel under marine environment, in particular to a low-driving-potential aluminum alloy sacrificial anode material and a preparation method thereof. The sacrificial anode material comprises the following components in percentage by weight: 0.5-1% of zinc (Zn), 0.018-0.05% of indium (In), 0.1-0.4% of silicon (Si), 0.1-1% of cerium (Ce), and the balance of aluminum (mark A199.85), wherein impurities are controlled as follows: Iron (Fe) not more than 0.12%, and copper (Cu) not more than 0.01%. The working potential of an aluminum alloy sacrificial anode in natural seawater is in a range from -0.77 V to -0.85 V (vs. Ag/AgCl); the current efficiency is not less than 85%; the consumption rate is not more than 3.5 kg+A-1+a-1; the dissolving morphology is uniform; corrosion products are easy to drop; and the aluminum alloy sacrificial anode can serve as a cathode protection sacrificial anode of such hydrogen embrittlement sensitive materials as high-strength steel.