Preparation method and application of modified dicyclopentadiene petroleum resin

The invention discloses a preparation method of modified dicyclopentadiene petroleum resin, which comprises the following steps: S1, adding quantitative dicyclopentadiene, single benzene ring olefin and acrylate into a thermal polymerization kettle, adding an inert solvent, uniformly stirring, introducing inert gas, extruding air in the thermal polymerization kettle, maintaining the pressure in the thermal polymerization kettle, and heating and stirring for reaction; s2, after the thermal polymerization kettle is cooled and decompressed, materials in the thermal polymerization kettle are transferred into a distillation kettle to be heated, unreacted materials are removed through distillation, and the modified dicyclopentadiene petroleum resin is obtained. According to the preparation method disclosed by the invention, good modification of the dicyclopentadiene petroleum resin can be realized under the condition of not adopting a catalyst, the conversion rate of introduced acrylate is high, and the resin color