A new and distinct cultivar of Hydrangea plant named ‘；Hokomagrevo’；, characterized by its compact, upright and somewhat outwardly spreading plant habit； moderately vigorous to vigorous growth habit and moderate growth rate； freely branching habit with strong and thick sturdy stems； freely flowering habit； compact mophead-type inflorescences with green, white and light purple-colored sterile flowers； and good postproduction longevity.
