This paper reports an external fluorescence seeding technology which can enhance the stimulated Raman scattering (SRS) in liquid-core optical fiber (LCOF). By surrounding a small section of LCOF with a glass capillary and a solution of Rhodamine 6G filled between them, fluorescent dye and Raman medium are seperated. The initial intensity of SRS is linearly amplified by external fluorescence seeding, and then the SRS of LCOF can be enhanced pollution-free and effectively. Experimental results show that the maximum enhancement of Stokes lines is obtained when the concentration of dye solution is optimized at about 10-6 mol/L.