Board supporters are seeking $17 billion in damages.
In November, a Federal Court justice struck down parts of the lawsuit that alleged expropriation and interference with economic relations. Among the plaintiffs was FortSt. John farmer Harold Bell.
Federal Agriculture Minister Gerry Ritz has said the ruling underscored the right of western Canadian farmers to market their own grain.
Stewart Wells, chairman of friends of the wheat board, says the appeal will seek to have all the claims reinstated in the lawsuit.