The invention provides a preparation method of a negative electrode active material for a lithium-ion battery. The method comprises the following steps: dissolving nonionic polysaccharide into a water solution, adding a certain amount of graphene-like transition metal disulphide, carrying out ultrasonic dispersing and stripping for a period of time and then centrifuging the solution to obtain a disperse solution of the non-ionic polysaccharide/graphene-like transition metal disulphide; carrying out freeze drying, roasting the product in a nitrogen atmosphere for a certain period of time, taking out the product, alloying and grinding the product and potassium hydroxide, and then burning and activating the mixture in the nitrogen atmosphere to obtain the graphene-like transition metal disulphide/porous carbon material. The graphene-like transition metal disulphide/porous carbon material is applied as the negative electrode material for the lithium-ion battery. The graphene-like transition metal disulphide is stripped through the non-ionic polysaccharide, so that the method is green, simple and effective; and meanwhile, the obtained graphene-like transition metal disulphide/porous carbon material is suitable for the negative electrode material for the lithium-ion battery, excellent in performance and beneficial to industrial production and application.