Preparation method of general-purpose multi-metal sulfide nano-material

The invention discloses a preparation method of a general-purpose multi-metal sulfide nano-material. The preparation method comprises the following steps of: taking two or more different metal diethyldithiocarbamates, or two or more different metal phenanthroline diethyldithiocarbamates, or the combination of the metal diethyldithiocarbamates and the metal phenanthroline diethyldithiocarbamates as reaction predecessors, performing co-thermal decomposition in a mixed solution of surfactants with different coordination properties, and performing nucleation and growth so as to prepare a high-quality multi-metal sulfide nano-material by one step. The multi-metal sulfide prepared by the preparation method disclosed by the invention has the advantages of pure phase state, adjustable composition, uniform and controllable appearance and size, high yield, low toxicity or no toxicity, better dispersivity in a non-polar organic solvent, easiness in control of reaction conditions, mild preparation conditions, simple operation, good repeatability and capability of realizing large-scale production.