▎ 摘　　要

NOVELTY - A graphene-iron oxide nano functional group is prepared by mixing 0.03-0.15 wt.% graphene and 0.005-0.2 wt.% biological protein dispersion, ultrasonically dispersing, adding 0.5-1.5 wt.% iron source to obtain mixed solution, biological hydrothermal mineralization reacting, cooling, water washing, centrifuging, drying to obtain mineralizing substance, and calcining. USE - The method is used for preparing graphene-iron oxide nano functional group in wave-absorbing material (claimed). ADVANTAGE - The method realizes controllable adjustment of frequency band and absorption intensity of wave-absorbing material to meet requirements of different field.