The invention discloses a low-surface energy fluorosilicone polymer and a preparation method thereof and relates to the field of organofluorine polymer paint. In the invention, an organosilicon polymer, perfluoroacyl monomers, a catalyst and a solvent are used as raw materials and are mixed in turn according to a mass part ratio of (60-80):(10-24):(0.0001-0.005):(30-50), the reaction product is purified, and thus, a high-fluoroacyl branched fluorosilicone polymer, which is one of the three perfluoroacyl monomers, or a high-fluoroacyl branched fluorosilicone polymer mixture of two or three of the three perfluoroacyl monomers. In the invention, because a catalytic reaction is performed by using a coordination compound of a transitional metal, the reaction conditions are mild, the process flow is short, the process is simple, the selectivity is high and the yield is high; the prepared polymer is a high-fluoroacyl branched fluorosilicone polymer; and the main chain of the polymer has a silicon-oxygen linear chain structure and has no other carbon-oxygen structure and the side chain is a perfluoroacyl with high fluorine content, so the low surface energy performance of organosilicon and fluorocarbon polymers can be fully played, and excellent low surface energy property can be realized.