However, if you're counting the entire Degrassi franchise, which began with "The Kids of Degrassi Street" in 1979, there are 14 total series with various spinoffs and reboots, each with multiple seasons:
* Degrassi: The Kids of Degrassi Street (1979-1986) - 7 seasons
* Degrassi Junior High (1987-1989) - 3 seasons
* Degrassi High (1989-1991) - 3 seasons
* Degrassi: The Next Generation (2001-2015) - 14 seasons
* Degrassi: Next Class (2016-2017) - 3 seasons
* Degrassi: The Next Generation (2001-2015) - 14 seasons
* Degrassi: Next Class (2016-2017) - 3 seasons
So, depending on what you're asking, the answer is either 14 or 14, with a whole lot of sub-series and reboots within the Degrassi universe.