Based on graphene (RGO)/polylactic acid (PLA) and RGO/Fe₃O₄/PLA composite absorbent wires, a three-layer pyramid absorbing body was printed using fused deposition forming technology. Through CST simulations and experiments, the influence of combining and distributing the absorbing agents (horizontal and stereo gradient distributions) on the absorption performance of the pyramid was investigated, and the absorbing mechanism was revealed. The results show that, for the homogeneous absorber, the absorption performance of the two-component absorber is better and improves with increasing graphene content. For the gradient distribution absorber (the pyramid height is 16 mm and the bottom dimension is 10 mm × 10 mm), when the stereo gradient distribution is adopted (the three-layer wave absorber graphene is added in amounts of 3%, 5%, and 7% in mass fraction), the strongest wave absorption effect can be achieved. Reflection losses of 6.1-18 GHz are lower than -10 dB, and the effective wave absorption bandwidth can exceed 11.9 GHz. The maximum absorption intensity is -45.8 dB at 17.2 GHz. Compared with the combination of absorbing agents, the distribution mode has a more significant impact on the absorbing ability of the pyramid. The wave absorber with stereo gradient distribution, on the one hand, improves impedance matching characteristics to ensure effective absorption bandwidth; on the other hand, increases multiple scattering, reflection, and spherical diffraction losses to improve absorption intensity.