If you mean you love the French language:
* J'aime le français. (This is the most common and direct way to say it.)
If you mean you love French culture, people, food, etc.:
* J'aime la France. (This translates to "I love France.")
* J'aime tout ce qui est français. (This translates to "I love everything that is French.")
* Je suis fasciné(e) par la culture française. (This translates to "I am fascinated by French culture.")
Choose the phrase that best suits what you want to express!