Former Hey Dad! star Robert Hughes will take his fight against child sex abuse convictions to the nation's highest court.

The 67-year-old was jailed for at least six years in 2014 after a jury found him guilty of 10 charges relating to sexual and indecent acts perpetrated on four young girls in the 1980s and 1990s.

Solicitor Greg Walsh says he has filed documents in the High Court seeking special leave to appeal against Hughes' convictions and jail term, after a pre-Christmas appeal bid was knocked back by the NSW Court of Criminal Appeal.

AAP