The invention provides an anode material for an aluminum-air cell and a preparation method thereof. The anode material comprises, by mass, 0.1-0.2% of Ga, 0.05-0.15% of Pb, 0.01-0.05% of Bi, 0.005-0.015% of Ti, 0.001-0.003% of B, less than or equal to 0.003% of Fe, less than or equal to 0.003% of Si, less than or equal to 0.005% of Cu, and the balance Al and other inevitable impurities. The preparation method of the anode material comprises the steps of melting and preparing of aluminum alloy melt, furnace injection blowing and refining, online grain refinement, online degassing and filtration, ultrasonic stirring and semicontinuous casting, cast ingot homogenization, and heating and extrusion. Through optimization to the compositions of the anode material and the preparation method thereof, the cleanliness and composition homogenization of the material are improved, the compactness and continuity of an oxidation film are destroyed, the electrochemical activity of the material is improved, and the hydrogen evolution self-corrosion rate is reduced. The anode material for the aluminum-air cell, provided by the invention, has the advantages of high electrochemical activity, low hydrogen evolution self-corrosion rate and high material utilization rate.