The invention relate to servo sealant and the preparation method for the gel-ink pen refill. The sealant is part by weight composed of 60-85 wt% of silicone oil with the viscosity of 1*103 mm2 /s, 8-15wt% of gas phase nanometer silicon dioxide, 1-5wt% of fluorosilicone oil used as the surface active agent, 1-5wt% of 95%ethanol used as the structure stabilizer and 5-15 wt% silicon rubber with the viscosity of 1*105-5*105 mm2/s; the servo sealant and the preparation method for the gel-ink pen refill has important promoting effects on the realization of the complete domestic production of Ink follower, the market occupation and the economic effect, and has profound meanings.