Abstract: The present invention provides a lithium-sulfur battery cathode material and a preparation method thereof, a lithium-sulfur battery cathode and a preparation method thereof, and the lithium-sulfur battery, and belongs to the field of lithium-sulfur batteries. The lithium-sulfur battery cathode material provided by the present invention includes MXene and functional carbon cloth, where the MXene is attached to a fiber surface of the functional carbon cloth, the MXene includes metal carbide or metal nitride, and metal components in the metal carbide and the metal nitride independently include titanium, vanadium, chromium or molybdenum; and the surface of the functional carbon cloth contains hydroxyl and carboxyl functional groups. The lithium-sulfur battery provided by the present invention has high cycle life, specific capacity and coulombic efficiency.