What does it mean to be the seventh generation champion?

It means that a person's family has had outstanding achievements and glories throughout the ages. This is an old idiom. Among them, the "Nine Dynasties' Emperor's Destiny" means that someone in a certain family served as emperor and enjoyed royal honor, while the "seven-generation champion" means that someone in a certain family won the champion in the imperial examination system, representing the family's knowledge and talent. This idiom is generally used to describe the glorious history and great achievements of a family.