The invention relates to an anode material for a lithium-air battery and a preparation method thereof. Through alkaline activation and catalytic activation, the anode material is prepared from a biomass carbon material. The anode material has a specific surface area of 800-2000m<2>.g<-1>, total pore volume of 0.8-2cm<3>.g<-1> and a ratio of mesoporous volume to total pore volume of 30-90%. The lithium-air battery prepared from the anode material has good discharge performances and has the advantages of simple processes, good technology repeatability, low cost and environmental friendliness.