The surface flashover caused by the spacer surface charge accumulation in GIL will affect the reliability of equipment operation. Therefore, a fluorine-containing epoxy resin is studied in this paper. The epoxy resin model, fluorinated epoxy resin model and direct fluorinated epoxy resin model were constructed by molecular dynamics method. After corona simulation, it was found that the damage depth of fluorine-containing epoxy resin was reduced by 23.7% and 21.2% respectively compared with the original model. Compared with the original epoxy resin model, the damage depth of the fluorinated model increased by 17.3% and 13.8%, respectively. The introduction of fluorinated groups (-CF3 and -F) at the microscopic parameter level can effectively improve the energy gap of single chain molecules and reduce the electron and hole traps. Thus, the initial discharge voltage is increased, the charge accumulation is reduced and the charge dissipation is promoted. The single-chain structure of directly fluorinated molecules is more curly and prone to physical defects. By comparing the residual mass, damage propagation depth and surface roughness, the fluorine-containing epoxy resin (F-DGEBA/MTHPA) system has more outstanding corona erosion resistance.