The invention discloses a method for preparing a graphene oxide quantum dot-brianyoungite ligand compound. The method comprises the following steps: firstly, preparing a graphene oxide quantum dot, adding concentrated nitric acid which is more than or equal to 20 times weight of carbon fibers into the carbon fibers, slowly adding concentrated sulfuric acid, further stirring, and performing ultrasonic treatment for 2-5 hours to disperse the carbon fibers into small particles; heating the mixed solution which is subjected to ultrasonic treatment to 100-150 DEG C for 16-36 hours, and adding water to dilute the solution after the solution is cooled; secondly, adding zinc sulfate heptahydrate which is 3-10 times weight of graphene into the solution prepared in the first step, sufficiently dissolving, regulating the pH of a proper amount of solution to 4-5.5 with anhydrous sodium carbonate, transferring the solution into a hydrothermal kettle, and reacting at 200 DEG C for 3-4 hours to obtain the ligand compound; and washing to remove impurities on the surface of a product. The prepared compound has a relatively good methylene blue adsorption characteristic, and can be used for treating pollution.