To obtain high-performance microwave absorbers, the 3D hierarchical structure material (MoS2/Fe3O4/graphene) has drawn much attention due to its superior structure and properties. Here, 3D architecture like flower structure of MoS2/graphene was synthesized by one-pot hydrothermal. Fe3O4 particles were grown on the petals of MoS2/graphene flower structure through co-precipitation route. Electromagnetic (EM) wave absorbing results of MoS2/Fe3O4/graphene demonstrate the maximum reflection loss (R-L) is -45.8 dB at 5.9 GHz for a coating of 2.5 mm, which is significantly enhanced compared with MoS2/graphene, in terms of absorption intensity and absorbing bandwidth. The absorption bandwidth less than -10 dB can achieve almost 7.4 GHz (4.6-9.7 GHz, 15.7-18 GHz) with a thickness of 2.5 mm. The excellent EM wave properties of MoS2/Fe3O4/graphene are ascribed to the suitable impedance matching and multi-polarization. Consequently, it is believed that the 3D hierarchical structure of MoS2/Fe3O4/graphene can serve as a potential EM wave absorber and can be used in practical applications. (C) 2017 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.