This study introduces a novel core-sheath CNT@MXene fiber with a gradient conductive structure, designed to achieve absorption-dominated electromagnetic interference (EMI) shielding. The fibers are fabricated using a coaxial wet spinning technique, where carbon nanotubes (CNTs) serve as the sheath and MXene as the core. This structure allows for the optimization of the conductive gradient within the fibers by adjusting the content of MXene and CNTs. The resulting fibers exhibit excellent EMI absorption, with a shielding effectiveness of 23.40 dB and an absorption coefficient of 0.63 within the X-band frequency range. The fibers maintain stable electrical conductivity under various conditions, including multi-cycle bending, stretching, ultrasonic treatment, and high relative humidity. The fabric also demonstrates EMI shielding stability in indoor environments. This work highlights the potential of gradient structured fibers for next-generation eco-friendly EMI shielding fabrics, addressing the issue of secondary radiation pollution.This study introduces a novel core-sheath CNT@MXene fiber with a gradient conductive structure, designed to achieve absorption-dominated electromagnetic interference (EMI) shielding. The fibers are fabricated using a coaxial wet spinning technique, where carbon nanotubes (CNTs) serve as the sheath and MXene as the core. This structure allows for the optimization of the conductive gradient within the fibers by adjusting the content of MXene and CNTs. The resulting fibers exhibit excellent EMI absorption, with a shielding effectiveness of 23.40 dB and an absorption coefficient of 0.63 within the X-band frequency range. The fibers maintain stable electrical conductivity under various conditions, including multi-cycle bending, stretching, ultrasonic treatment, and high relative humidity. The fabric also demonstrates EMI shielding stability in indoor environments. This work highlights the potential of gradient structured fibers for next-generation eco-friendly EMI shielding fabrics, addressing the issue of secondary radiation pollution.