The invention provides a lithium-sulfur battery composite positive electrode and a preparation method thereof. The lithium-sulfur battery composite positive electrode mainly comprises a mixed spraying layer of a ferroelectric material and graphene, a carbon/sulfur paste scrapping layer and a ferroelectric material spraying layer. The volume expansion of the positive electrode material during the charge-discharge process can be reduced by the two spraying layers, and the structural stability is maintained; and a long-chain polysulfide is doubly absorbed by the two spraying layers, the dissolution of the polysulfide is limited, a shuttle flying effect is effectively solved, the specific capacity of the lithium-sulfur battery is improved, and the cycle lifetime of the lithium-sulfur battery is prolonged. By a simple spraying process, a thin film layer with a controllable thickness is sprayed, and the spraying process is suitable for wide production.