The former France international's position at the Parc des Princes had reportedly been under scrutiny following the capital club's disappointing Champions League quarter-final exit at the hands of Chelsea.
However, Blanc has subsequently led PSG to the Coupe de la Ligue and Ligue 1, with Les Parisiens crowned champions of France for the second consecutive season thanks to Monaco's draw with Guingamp on Wednesday night.
PSG were surprisingly beaten 2-1 at home to Stade Rennais later in the evening but that did not detract from what has been a fine season for the club.
"Laurent Blanc is going to stay at Paris Saint- Germain, that's for sure" Al-Khelaifi told Canal Plus.
"Cavani? He is staying here with us.
"I am very happy and very proud of my team. It was a great season in the Champions League, the championship and Coupe de la Ligue. We have had the results we wanted.
"This is better than last year in terms of results and the quality of our play."
Al-Khelaifi also played down the significance of reports claiming PSG are set to be fined and sanctioned over their failure to fully comply with all of the requirements outlined in Uefa's Financial Fair Play rules.
"I am very confident about Financial Fair Play, as we're speaking with Uefa," he explained.
"I do not confirm the sanctions against PSG, but we will be playing in the Champions League [next season].
"There may be conditions but not much. Our project continues and nobody has to stop dreaming!
"I do not think we will need a lot of players, but if we do, we will buy."