The skyscraper in Casablanca will be 540 metres (1,782 feet) high, taller than the 223-meter Carlton Centre in Johannesburg which currently holds the title for tallest building on the continent.
"It will be Africa's highest tower," project manager Amede Santalo said.
It will be built by the Dubai-based Middle East Development LLC, owned by Saudi businessman Sheikh Tarek Binladen, and will cost an estimated $1 billion (800 million euros), he added.
The project's working title is the "Al-Noor Tower" (Tower of Light in Arabic), but it is expected eventually to be named after King Mohamed VI.
The tower is due for completion in June 2018.
"The hight of the tower is 540 metres to remind us that Africa has 54 countries. Everyone in Africa will feel part of that tower," the project's website says.
It will have 114 floors -- the number of surahs or chapters in the Koran -- and the facade will be covered by patterns representing Africa's 1,000 languages.
It will be built on a 25-hectare (61.77-acre) plot and will include a seven-star hotel, a business centre and a shopping mall.
The world's tallest tower is in Dubai, the 828-metre Burj Khalifa, which opened in January 2010.
