The invention discloses a method for preparing a lithium-sulfur battery anode material by recycling waste lithium thionyl chloride batteries. The method comprises the following steps: (1) removing discharged waste lithium thionyl chloride batteries, and collecting a sulfur/carbon black mixture of an anode; (2) washing with a volatile organic solvent, and collecting residues after filtering; and (3) adding into an acid solution, heating and stirring, filtering, washing with water to be in neutral, drying, and collecting the obtained sample. The method can be used for preparing a lithium-sulfur battery anode material by recycling the waste lithium thionyl chloride batteries, wherein elemental sulfur is very uniformly distributed in carbon black, sulfur in the product has very uniform dispersibility and has strong interaction force with carbon black, and carbon black is good in electrical conductivity and can well buffer and restrain sulfur volume expansion. The method disclosed by the invention is simple and feasible, economical and environment-friendly and easy to realize large-scale production, and has broad application prospects, economic benefit values and social environmental protection values.