The invention belongs to the technical field of the corrosion and protection of metal materials in the marine environment, and relates to a low-driving potential aluminium alloy sacrificial anode for the oil-contaminated seawater environment. The sacrificial anode adopts high-purity aluminium as main material, and is added with zinc, bismuth and silicon, wherein the weight percentage of each component is as follows: 0.5 to 2.0 percent of zinc, 1.0 to 3.0 percent of bismuth, 0.10 to 0.50 percent of silicon, 0.15 percent or less of other impurities (magnesium, indium and titanium), 0.15 percentor less of iron and the balance of aluminium. The casting technique is adopted to produce the sacrificial anode, the working potential of the sacrificial anode in oil-contaminated seawater is betweennegative 0.75V and negative 0.85V, the current efficiency is not less than 75 percent, moreover, the sacrificial anode can be uniformly dissolved, and product can easily come off. The sacrificial anode can be used for protecting high-strength steel, stainless steel, titanium alloy and other materials in the oil-contaminated seawater environment.