Supakar was a lawyer by profession. He was associated in different capacities with many educational institutions and Universities. A firm believer in civil liberties, Supakar was Chairman of Reception Committee, All India Civil Liberties Conference, Cuttack Session held in 1954.
He served as Leader of Opposition during 1952-1956 and as pro tem speaker in 1985.
He was a member of Odisha Legislative assembly, Lok Sabha and Rajya Sabha. He was also a member of Odisha Text Book Committee during 1939-1941. Shraddhakar Supakar was an elected member of Odisha Legislative Assembly during 1952-1956 and 1985-1990 representing Rairakhol and Sambalpur constituency.
He was an elected member of Second and Fourth Lok Sabha during 1957-1962 and 1967-1970 representing Sambalpur constituency of Odisha.
He was also a member of Rajya Sabha during 1965-1967.
