A type of dual tunable broadband metamaterial absorber based on graphene and vanadium dioxide pattern is designed, of which the dynamically tunable characteristics can be achieved based on the properties of vanadium dioxide (VO2) and graphene. It is well known that VO2 has the characteristic of phase transition at a temperature of 68°C, while the conductivity of graphene can be changed by adjusting its chemical potential. When the conductivity of VO2 and the chemical potential of graphene are 200 000 S/m and 0.5 eV, respectively, the bandwidth of the proposed absorber with an absorption rate exceeding 90% can reach 4.2 THz. Study results will show that by keeping the conductivity of VO2 unchanged, the location and the smoothness of the broad absorption band can be adjusted by the chemical potential of graphene to a certain degree. If the chemical potential of the graphene is fixed at 0.5 eV, the maximum absorptionrate of the broad absorption band can be significantly adjusted by the conductivity of VO2, and the maximum modulation depth can be as high as 75%. Therefore, the proposed metamaterial absorber not only has the characteristic of dynamically tunable absorption bandwidth but also has the function of modulating or switching in the electromagnetic waves. The absorption mechanism is analyzed according to the distribution of the electric fields along the VO2 and graphene. Next, the effect of different geometric parameters of the absorber on the absorption properties has also been studied, from which optimal geometrical parameter ranges can be selected for further laboratory fabricating and testing. Meanwhile, through the research of the absorption properties under different polarization angles and incident angles, it is found that the proposed metamaterial absorber possesses the characteristics of polarization-insensitive and wide incident angles. In terms of the dual tunable properties originating from the conductivity of VO2 and the chemical potential of graphene, it makes the proposed metamaterial absorber have potential applications in the area of THz absorbing, switching and modulating.