The invention discloses a formula of a light automobile wheel hub. The light automobile wheel hub is prepared from, by weight, 40-55 parts of titanium ingots, 10-16 parts of manganese ingots, 10-16 parts of tin ingots, 5-8 parts of magnesium ingots, 5-8 parts of iron ingots, 5-8 parts of zinc ingots, 2-4 parts of copper ingots, 2-4 parts of niobium ingots, 2-4 parts of strontium ingots, 2-4 partsof tin ingots, 1-3 parts of silicon nitride and 1-3 parts of antimony trisulfide. The invention further provides a preparation technology of the light automobile wheel hub. The weight of the hub can be reduced, the strength of the hub can be ensured, the pressure resistance of the hub is improved, the raw materials are subjected to heat treatment in advance, and the activity of the raw materials can be stimulated, so that the mechanical strength of the hub is high, particularly, the impact resistance of the hub is excellent, and using safety of the hub is ensured.