Based on impedance matching theory and the multilayer local surface plasmon resonance coupling effect ,we designed a multilayer graphene-black phosphorus tunable anisotropic absorber. We used the finite-difference time-domain method to simulate and analyze the results. Under TE polarization ,we achieved an average broadband absorption of94% in the wavelength rangeof20. 8~45. 34μm. UnderTM polarization ,weachieved an averagebroadband absorption of96. 3% in the wavelength range of16. 6~44. 6 μm ,thus indicating a certain degree of anisotropic absorption. In addition ,the absorption bandwidth can be altered by adjusting the width of the graphene-black phosphorus block. Simultaneously ,dynamically adjusting the Fermi level of graphene or the electron-doping concentration of black phosphorus can alter the absorption bandwidth and average absorption rate. The results of this study are theoretically significant in the fields of dynamic tunable infrared-energy acquisition ,polarization-selective absorption ,and infrared camouflage.