The invention discloses a 
lithium-
sulfur battery 
cathode material, a preparation method, and a 
lithium-
sulfur battery, and belongs to the technical field of 
lithium-
sulfur battery materials. The lithium-sulfur battery 
cathode material is a carbon-sulfur 
composite material, which is coated by a carbon cladding layer with a micro-porous structure. In the preparation method, under a vacuum condition, the raw materials are heated, just in one step, the sulfur and the 
carbon matrix are uniformly combined, the carbon precursor is carbonized, and the 
coating on the carbon-sulfur 
composite material is achieved. Compared with the conventional low-temperature 
coating method, the carbon cladding layer, which is carbonized at a high temperature and has a micro-porous structure, can form interactions just like the chemical bonds with the carbon-sulfur 
composite material; so that the micro-
porous carbon cladding layer and the carbon-sulfur composite material are tightly combined together, thus the sulfur and 
discharge products cannot be easily dissolved in the 
electrolyte, the shuttling effect is prevented, the 
utilization rate of sulfur is improved, at the same time, the 
conductivity of the 
cathode material is better improved, and the cycle stability and capacity 
retention rate of the lithium-sulfur battery are both improved.