▎ 摘　　要

NOVELTY - Preparing magnetically reduced graphene oxide-based composite material involves providing graphene oxide material, mixing the oxidized graphene material, trivalent iron salt, amine compound and dispersing solvent uniformly to form an graphene dispersion, mixing the graphene dispersion liquid with, reducing substance, obtaining reaction precursor liquid, carrying out solvent thermal reaction to the reaction precursor liquid to obtain magnetically reduced graphene oxide-based composite material. USE - Method for preparing magnetically reduced graphene oxide-based composite material used in field of oil-water separation (claimed). ADVANTAGE - The method can properly adjust the degree of expansion according to the demand, which expands the scope of application, and can obtain graphene oxide composite materials with different hydrophilic and lipophilic properties by adjusting the amount of reducing substances added, further expands the application range. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: 1. a magnetically reduced graphene oxide-based composite material; and 2. an oil-water separation method, which involves separating oil-water separation system with the magnetic reduction graphene oxide-based composite material, oil-water separation system includes oily wastewater, preferably including one or more combinations of oil-in-water emulsion, floating oil on water surface, and oil-water mixture.