The invention discloses a high-strength automobile hub and a preparation method thereof. The automobile hub is made of an alloy. The alloy comprises, by mass percent, 3%-12% of silicon, 0.1%-5% of carbon, 0.01%-3% of copper, 1%-10% of manganese, 1.2% or less of calcium, 0.1%-8% of chrome, 3.5% or less of iron, 5%-18% of zinc oxide, 0.001%-0.5% of phosphorus, 0.01%-1% of nickel, 0.001%-0.3% of molybdenum, 0.005%-0.8% of tungsten, 0.0001%-0.5% of lead, 0.001%-0.3% of strontium, 1%-15% of magnesium borate, 0.2%-10% of potassium titanate and the balance aluminum. During smelting, the components are taken and, by weight percent, put into a smelting furnace to be subjected to smelting and deslagging, and then by means of refining, standing, pouring, pressurizing, cooling and demolding, the automobile hub is obtained. According to the high-strength automobile hub and the preparation method thereof, the components are scientific and reasonable, the formula is simple, the preparation process iseasy to implement, and the obtained hub is high in strength, resistant to corrosion, impact and abrasion, good in heat resistance, long in service life and good in casting performance. The preparation process is simple and easy to operate, the energy consumption is low, the production efficiency is high, and the high-strength automobile hub is suitable for being produced on a large scale.