The invention discloses a low-stibium aluminum-brass alloy with dezincification corrosion resistance and a preparation method thereof. The alloy comprises the following chemical components: 58.8 to 63 weight percent of copper, 0.25 to 0.65 weight percent of aluminum, 0.105 to 0.35 weight percent of stibium, 0.03 to 0.25 weight percent of lead, 0.04 to 1.5 weight percent of other element, and the balance being zinc and inevitable impurities, wherein the weight percentage of the copper, the zinc, the aluminum, the stibium and the lead is more than 98.2 weight percent, and the other element is at least one element selected from boron, tin, phosphorus, nickel, bismuth and iron. The preparation method comprises: adopting methods of alloying treatment, covering, protecting, dreg removing, purifying and refining, casting the low-stibium aluminum-brass alloy by fusion, thermally processing the alloy at a temperature of between 680 and 740 DEG C; and then carrying out cold processing and intermediate thermal treatment on the alloy, and carrying out stress relieving annealing at a temperature of lower than 380 DEG C after a finished product is subjected to cold processing. The alloy product has the advantages of excellent dezincification corrosion resistance, thermal forming property, mechanical property and easy polishing and plating properties, good cutting property, remarkably excellent hygienic safety, simple manufacturing technique, low cost and easy recycling.