Huberdeau led the team in points last season.
Huberdeau was the team’s leader in points last season with 15 goals and 39 assists last season. Huberdeau, 22, won the Calder Trophy in 2012-13 as the league's top rookie.
The two sides had discussed signing Huberdeau, a restricted free agent, to a one-year offer sheet, but that would have made him an unrestricted free agent next offseason.
The deal will pay Huberdeau $2.5 million in the first year and $4 million in the second.
The Panthers finished with 91 points last season, narrowly missing the postseason. Florida has made the playoffs just once in the last 14 seasons.