The invention belongs to the technical field of material preparation, and provides a preparation method of a nickel cobalt hydroxide/carbon nano tube compound used for supercapacitors. The preparationmethod comprises the following steps: dispersing a certain amount of oxygen-containing functional group modified carbon tubes into a certain amount of a methanol solution, adding a certain amount ofcobalt nitrate and nickel nitrate and a certain amount of a 2-methylimidazole methanol solution, after reacting for a certain period of time, carrying out backflow on an obtained sample in an ethyl alcohol-water solution for a period of time, and thus obtaining the nickel cobalt hydroxide/carbon nano tube compound. The preparation method is simple and high in controllability, uniform compounding of carbon nano tubes and nickel cobalt hydroxide can be guaranteed without long-time high-temperature treatment, and the prepared nickel cobalt hydroxide/carbon nano tube compound as an electrode material has relatively high specific capacitance and rate performance.