To provide a production method of hydrogenated petroleum pellets, in which an antioxidant can be easily, efficiently and uniformly mixed.

In the production method, a cyclopentadiene compound and a vinyl aromatic compound are thermally polymerized in a polymerization unit 2, and then subjected to a hydrogenation reaction in a hydrogenation reaction unit 3. After the majority of a hydrogenation solvent is separated in a solvent evaporation tank 41 from the hydrogenation reaction product obtained in the hydrogenation reaction unit 3, an additive prepared by separately dissolving an antioxidant is added to the product in an addition unit 43. The additive is prepared by dissolving the antioxidant in an aromatic additive solvent having the same number of carbon atoms as the number of carbon atoms in the hydrogenation solvent, which is a naphthenic solvent. A low-molecular weight component is separated together with the residual hydrogenation solvent and the additive solvent in a thin-film evaporator 42 from the hydrogenation reaction product to which the additive is added. The obtained molten resin is granulated in a granulation unit 5 to produce hydrogenated petroleum resin pellets. The time for uniformly mixing the antioxidant can be reduced.