 This study demonstrates the integration of efficient electromagnetic, EM, absorption and green shielding into one material, which is achieved by tailoring the internal structure of NECO-204 nanofibers. As the conductivity rises, the reflection loss decreases from minus 52.72 dB to minus 10.5 dB, while the EM interference shielding effectiveness increases to 13.4 dB, indicating the coexistence of the two EM functions. Furthermore, based on the high EM absorption, a strain sensor is designed through the resonance coupling of the patterned NECO-204 structure. This study provides a new strategy for tuning EM performance and constructing devices, which can be extended to other EM functional materials to promote the development of electromagnetic-driven devices. This article was authored by Min Zhang, Chen Han, Wen Chengqiao and others.