He has been at a Seoul detention centre since his arrest last month.
Lee has previously accused the current liberal government of President Moon Jae-in of retaliating over the 2009 death of Moon's friend, liberal ex-President Roh Moo-hyun, who leapt to his death during a corruption investigation of his family.
Park, South Korea's first female president, has also called herself a victim of "political revenge".
She's been refusing to attend court sessions since last October and didn't show up for Friday's verdict, citing an unspecified sickness.
Lee has also been refusing to undergo questioning since his March 22 arrest.
South Korea has taken a series of steps aimed at rooting out corruption in recent years, but high-profile graft scandals involving politicians and business leaders often occur.
- AP