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That ruling came a year after she was removed from office following months of street rallies over the corruption scandal that also led to the arrests of dozens of high-profile figures.
The Seoul High Court handed out a 25-year prison sentence Friday after concluding Park took more money in bribes than initially believed. The court increased her fine to 20 billion won ($17.8 million).
The court said both Park and prosecutors have one week to appeal.
Park is the daughter of late dictator Park Chung-hee. She was elected as South Korea's first female president in late 2012.
Her stunning fall dealt a serious blow to conservatives in South Korea, helping liberal Moon Jae-in score an easy victory in a presidential by-election in May last year.
Park has called herself a victim of political revenge.
In July, Park received an additional eight years in prison for abusing state funds and violating election law in a separate election law. That made the 66-year-old face the prospect of more than three decades behind bars.