Abstract: The present disclosure relates to the technical field of batteries, and specifically relates to a polyamine composite material and a preparation method therefor, a slurry, a separator, an electrode sheet, and a lithium-sulfur battery containing the same. The polyamine composite material comprises a carboxylated carbon-based material serving as a substrate and a polyamine serving as an outer surface layer, and the polyamine is uniformly and smoothly coated on the outer side surface and/or the inner pore surface of the carboxylated carbon-based material. The material is rich in amino groups and is uniform and stable, can be used in the lithium-sulfur battery, and can effectively adsorb lithium polysulfide during a long cycle process.