The synthesis of high solid content and low viscosity fluorocarbon resin is one of the important ways to improve the environmental protection of solvent based fluorocarbon anti-corrosion coatings. Polymerizable acrylic hydrogenated rosin ester monomer was prepared by hydrogenating rosin from biomass raw materials, and high solid content and low viscosity bio-based fluorocarbon resin was further prepared using free radical polymerization method. The viscosity reduction mechanism of acrylic hydrogenated rosin ester was analyzed using molecular dynamics simulation method. And the coating performance of bio-based fluorocarbon resin was explored. It is indicated that with the increase of monomer content of acrylic hydrogenated rosin alcohol ester, the viscosity of modified fluorocarbon resin decreases. When the monomer content of acrylic hydrogenated rosin alcohol ester is 18.6%, the solid content of modified fluorocarbon resin is 78.56%; its kinematic viscosity is equivalent to that of fluorocarbon resin modified by tert ethylene carbonate monomer, and far lower than that of modified fluorocarbon resin without large volume side groups; Compared with petroleum resin tert ethylene carbonate, hydrogenated rosin acrylate monomer has larger space volume, lower intermolecular interaction force and lower viscosity; The hardness and adhesion of fluorocarbon coatings modified by acrylic hydrogenated rosin ester are higher than those modified by tert ethylene carbonate, and the chemical corrosion resistance is slightly lower than that of tert ethylene carbonate modified fluorocarbon coatings.