Ceramic-carbonate dual-phase membranes have attracted a lot of attention because of the emission of CO2 and environmental problems. In this study, a dense SrFe0.8Nb0.2O3-delta-carbonate dual-phase multichannel hollow fiber membrane has been successfully prepared via a phase inversion-sintering technique and impregnation. The morphology, crystal structure, phase stability, breaking load, and CO2 permeation flux of the as-prepared membranes were systematically investigated. The membrane not only had a higher CO2 permeation flux but also was of good thermomechanical stability in thermal recycles. Meanwhile, the membrane can be operated stably at 973 K over 200 h without any degradation of CO2 permeation flux. Our work demonstrates that the ceramic carbonate dual-phase mixed-conducting multichannel hollow fiber membrane is a promising candidate for postcombustion CO2 capture.