A decarboxylative alkenylation reaction system was constructed for the first time to prepare vinyl-terminated liquid fluoroelastomer (CTLF) with higher end-group activity. Selecting the silver carbonate (Ag₂CO₃) as catalyst, potassium persulfate (K₂S₂O₈) as oxidant, and allyl phenyl sulfone as allyl reagent, the effects of reaction temperature, reaction time and dosing ratio on the decarboxylative alkenylation reaction were clarified. The molecular chain structure and end group conversion rate of the telechelic liquid fluoproelastomers (VTLF) were analyzed by infrared spectroscopy (FT-IR), ¹H nuclear magnetic resonance (¹H-NMR), fluorine spectroscopy nuclear magnetic resonance (¹⁹F-NMR) and chemical titration. The research results indicate that the Ag₂CO₃/K₂S₂O₈ system can effectively decarboxylate carboxyl group in CTLF, so as to introduce vinyl group into the end of the molecular chain. Under the optimal reaction conditions of 4 h×50 ℃, [COOH]:[Ag₂CO₃]:[K₂S₂O₈]:[Allyl phenyl sulfone]=1.0:0.8:0.3:2.0, the conversion rate of carboxyl groups could reach 73% and the fluorine content is kept at 63.24% . Meanwhile, the thermal properties were tested by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA), and the thermal decomposition temperature (T_d) of VTLF increases from 245 ℃ to 256 ℃ . Meanwhile, VTLF can be successfully photocured, realizing the efficient curing of liquid fluoroelastomers at room temperature.