NOVELTY - Production of aggregate-type hindered phenol antioxidant involves reacting p-cresol with dicyclopentadiene and a non-water-solubility solvent through an organic composite sulfonic acid catalyst under the anhydrous condition, obtaining p-cresol-dicyclopentadiene resin (I), then adding tert-butyl methyl ether to produce p-cresol-dicyclopentadiene-isobutylated resin crude product (II), adding dicyclopentadiene, washing crude product by water and carrying out steam distillation on crude product.    USE - Production of aggregate-type hindered phenol antioxidant (claimed).    ADVANTAGE - The aggregate-type hindered phenol antioxidant is economically produced with low ash content, and high purity, and product yield of more than 95% without polluting the environment, by a simple method.    DETAILED DESCRIPTION - Production of aggregate-type hindered phenol antioxidant involves reacting p-cresol with dicyclopentadiene and a non-water-solubility solvent through an organic composite sulfonic acid catalyst under the anhydrous condition, obtaining p-cresol-dicyclopentadiene resin of formula (I), then adding tert-butyl methyl ether to produce p-cresol-dicyclopentadiene-isobutylated resin crude product of formula (II), or reacting the p-cresol with tert-butyl methyl ether and the non-water-solubility solvent through the organic composite sulfonic acid catalyst under the anhydrous condition, obtaining o-tert-butyl p-cresol, then adding the dicyclopentadiene to produce the p-cresol-dicyclopentadiene-isobutylated resin crude product, washing the crude product by water and carrying out steam distillation on the crude product. The non-aqueous solvent is benzene, xylene or chlorobenzene. The molar ratio of p-cresol and dicyclopentadiene is 1.5-2:1. The molar ratio of tert-butyl methyl ether and dicyclopentadiene is 1.5-2:1. The ratio of organic sulfonic acid catalyst and dicyclopentadiene is 0.01-1:1. The mass ratio of water-insoluble solvent and dicyclopentadiene is 5:1.    n=1 or 2.