In this work, a pyramid-like MMA based on IL [Emim][N(CN)2] (P-L ILMMA) is proposed. The absorption exceeds 90% when P-L ILMMA is utilized within the frequency range of 3.74-50.00 GHz, exhibiting a relative absorption bandwidth of 172%. When the incidence angle is 70°, the absorption exceeds 90% in the range of 7.05-50.00 GHz (TE) and 6.45-50.00 GHz (TM). Due to the excellent thermal stability of IL, P-L ILMMA still maintains excellent absorption performance within the temperature range of 25-100 ℃. Furthermore, P-L ILMMA demonstrates a lack of sensitivity to polarization, exhibiting consistent absorption performance across the entire polarization angle range of 0-90°. The high absorption efficiency is attributed to the synergistic impedance matching and electromagnetic energy dissipation that are enhanced by the P-L structure design. Experimentally validated absorption efficiency exceeding 90% is achieved across 3.87-40.00 GHz (TE) and 7.65-40.00 GHz (TM). Under 70° oblique incidence, over 90% absorptivity is maintained in both polarization modes, with absorption bandwidth spanning 12.74-40.00 GHz (TE) and 14.74-40.00 GHz (TM). The combination of these advantages positions P-L ILMMA as a promising candidate for next-generation broadband absorbers in electromagnetic shielding, stealth technology, and microwave engineering applications.