Cement stone is a natural brittle material. If the cement sheath is broken，it will lead to sealing failure. In order to prevent the cement stone from being destroyed under the impact of external load，the carbon fiber mixture （1 mm carbon fiber and 0 . 7 mm carbon fiber at a mass ratio of 4 ∶ 1） that could be uniformly dispersed in cement slurry，was liquefied and dispersed to obtain liquid fiber with good dispersibility. Epoxy resin was modified to obtain resin emulsion that could improve flexibility and disperse stress. The synergistic effect of liquid fiber and resin emulsion on the mechanical properties of cement stone was studied in laboratory. The results showed that when the dosage of liquid fiber was 1 % and the dosage of resin emulsion was 3 %，the rheological property of the cement slurry was good，and the water loss was less than 40 mL，which could meet the thickening requirements of on-site construction. The mechanical properties of the formed cement stone were better than those of ordinary cement stone，and cement stone doped with single liquid fiber or single resin emulsion elastic-tough material. After 14 days of curing，the compressive strength of the cement stone was 43 . 2 MPa，the flexural strength was 14 . 1 MPa，and the impact strength reached up to 2 . 39 kJ/m² after 14 days of curing. Compared with common cement stone，the elastic limit strain was increased by 93 . 2 %，and the elastic modulus was decreased by 74 . 2 %，indicating that the elasticity of cement stone was improved obviously. The doped liquid fiber and resin emulsion had a good strengthening and toughening effect on cement stone，which ensured the long-term sealing performance of the cement sheath under external load environment and improved the impact resistance of cement stone.