The 27-year-old's previous deal with the Stadio San Paolo side was due to expire at the end of the season and Juventus and Inter were closely monitoring the midfielder's situation.
|10/3||Napoli are 10/3 with Paddy Power to win Serie A
"I have always believed in Camilo and he has always believed in Napoli," De Laurentiis said.
"Figures? He gets what he deserves. He has always worked hard for the team and has always remained humble. He deserves this recognition."
Zuniga joined Napoli from Siena in the summer of 2009 and has since made over 100 Serie A appearances for the Partenopei.
"I'd like to thank the president for his faith and the fans for the affection they've shown me. I am very happy at Napoli and would like to end my career at his club," Zuniga commented on his contract renewal.