Discussed is a method for preparing a sulfur-carbon composite including the steps of: (a) mixing a carbon-based material with sulfur or a sulfur compound to prepare a sulfur-carbon mixture; (b) placing the sulfur-carbon mixture mixed in step (a) and a liquid which is vaporizable into a sealable container; and (c) heating the sealed container to a temperature of 120 to 200° C. to vaporize the liquid and prepare the sulfur-carbon composite. Also discussed is a positive electrode for a lithium secondary battery including the sulfur-carbon composite prepared by the above method, and a lithium secondary battery including the above positive electrode.
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