The invention discloses a method for preparing a metal organic framework-graphene oxide composite material. The method comprises the following steps: adding graphite powder into a mixed solution of concentrated sulfuric acid, sodium nitrate and potassium permanganate for oxidizing, adding water for hydrolyzing, and finally, adding H2O2, thereby obtaining graphene oxide; filtering, washing with water, centrifuging, and performing spray drying, thereby obtaining solid powder GO; and dispersing the solid powder GO in water, performing ultrasonic treatment, adding Cr(NO3)3.9H2O, terephthalic acid and hydrofluoric acid, reacting at the temperature of 210-230 DEG C for 67-77 hours, washing and soaking by using N,N-dimethyl formamide, drying, and activating, thereby obtaining the purified GrO@MIL-53 adsorbing material, namely the metal organic framework-graphene oxide composite material. Compared with common MIL-53, the adsorbent prepared by the method has the advantages that the specific surface area and pore volume are increased, and the adsorbent has relatively high CO2 adsorption capacity.