The invention relates to a preparation method of a nitrogen-sulfur double-doped graphene negative electrode material by low-temperature molten salt method. The preparation method comprises the following steps: uniformly dispersing graphene oxide in deionized water, dissolving potassium thiocyanate in deionized water, uniformly mixing an obtained dispersion liquid with an obtained salt solution, and drying to obtain a compound; introducing the compound into a tubular furnace filled with inert gas to fully react, washing a reaction product with a large amount of deionized water after the reaction is finished, and drying to obtain the nitrogen-sulfur double-doped graphene negative electrode material. Compared with the prior art, industrial products which are low in price and easy to obtain are adopted as raw materials, high-temperature calcination is avoided, and the method has the advantages of being simple in synthesis process, high in controllability, low in cost, and wide in raw material range, and batch preparation can be realized. The prepared nitrogen-sulfur double-doped graphene has the advantages of high capacity, good cycling stability and the like as a lithium ion battery negative electrode material.