<p>Plant fibers with high toughness and distinctive microstructural features were employed as carrier media in self-healing cementitious materials. A discrete element model of fiber-reinforced cement stone was established, in which equivalent CaCO₃ deposition was incorporated to represent the healing effect associated with carrier-assisted MICP. The effects of fiber size, fiber dosage, CaCO₃ generation amount, generation range, and generation size on the static and cyclic hydro-mechanical performance of cement stone were investigated, and regression models were established for the main influencing factors. Comparisons were also made with cement stone containing particulate carriers. The results showed that appropriately selected fiber parameters improved the mechanical strength and impermeability of cement stone, with maximum increases of 13.26% and 43.92% in compressive and flexural strength, respectively, and a maximum permeability reduction of 2.9% relative to plain cement stone. When the CaCO₃ generation amount was 60%, the generation range was 3 times the fiber diameter, and the generation size was 10–15&#xa0;μm, the compressive and flexural strengths reached 45.8&#xa0;MPa and 7.16&#xa0;MPa, corresponding to increases of 34.7% and 97.8%, respectively. The introduction of carriers and CaCO₃ also improved the performance retention of cement stone under cyclic loading; after 200 cycles, the compressive strength remained 15.1% and 37.8% higher than that of plain cement stone, indicating reduced sensitivity to cycle number and cyclic peak stress within the investigated range. Compared with the particle carrier system, the fiber carrier system showed a 33.6% greater improvement in flexural strength, suggesting a more pronounced enhancement in flexural performance and improved resistance to strength degradation under the investigated cyclic loading conditions.</p>