Design of high-yield light conversion agent with excellent processability is of important research value for synthesizing agricultural light-converting films. Bromine-substituted triphenylethylene and 4-vinylphenylboronic acid were used as raw materials to synthesize monomer VP3St by Suzuki coupling reaction. And the synthesized monomer VP3St was polymerized into polymer PVP3St via radial polymerization in the presence of initiator AIBN. UV-vis and fluorescence characterizations show that the maximum emission wavelength of PVP3St is 443 nm, and the intensity is gradually improved with increased water fraction, showing unique aggregation-induced emission property. In addition, the 5% mass loss temperature of PVP3St is determined to be 461 oC, implying the high thermal stability. Further, PVP3St was introduced into polycaprolactone (PCL) and polymethyl methacrylate (PMMA) to fabricate the light conversion polymer films PVP3St-PCL and PVP3St-PMMA, which have excellent light transmittance (>90%) in the range of 410~800 nm, and respectively show the maximum stress of 1456 kPa and 1157 kPa with strains of 1147% and 247.9%, respectively. More importantly, PVP3St-PCL and PVP3St-PMMA could effectively absorb the light of 230~400 nm to show blue fluorescence emission, which highly overlap with the UV-vis spectrum of chlorophyll with rates of 73.5% and 77.7%, contributing to the photosynthesis for improving crop quality and yield.