The invention discloses a preparation method of a 3D honeycomb-like reduced grapheme oxide tin disulfide compound. The method comprises the following steps: S1: adding grapheme oxide and polystyrene balls into deionized water, and conducting ultrasonic treatment to disperse uniformly; S2: adding tin tetrachloride pentahydrate into a solution obtained in step S1, and sufficiently stirring to obtain a homogeneous solution; S3: performing spray drying treatment by taking a solution obtained in step S2 as a spray-drying precursor; S4: transferring a product obtained in step S3 into a tube furnace, heating under the protection of an inert gas, and cooling naturally to room temperature; S5: putting thiocarbamide and a product obtained in step S4 into the tube furnace, and reacting under the protection of the inert gas to obtain 3D RGO / SnS2. The 3D RGO/SnS2 sample prepared by the preparation method disclosed by the invention has uniform size, good controllability and high crystallinity.