The Spaniard has guided the Italian side to back-to-back wins in Serie A, having managed just four points from a possible 12 prior to those two victories.
Benitez also failed to secure a passage into the Champions League as the Partenopei lost a two-legged preliminary to Athletic Bilbao, but De Laurentiis claims to be content with the club's direction.
"Benitez is doing a great job with a group that is growing every day without giving up anything until the last," the Napoli supremo wrote on Twitter.
"I am also very happy with all the lads who are proving how much they care about the jersey by working with great professionalism."
The ex-Liverpool manager takes his Napoli side to former club Inter Milan on Sunday night.