Les Bleus broke the deadlock when Kylian Mbappe fired from close range, assisted by Theo Hernandez in the 61st minute.
After eight minutes, the Danish national team leveled the match with a header from defender Andreas Christensen.
In the 84th minute, France took the lead as Mbappe scored again.
Earlier in the day, Australia beat Tunisia 1-0 as the goal came from Mitchell Duke in the 23rd minute at Al Janoub stadium in another Group D match.
France top standings with six points, three points ahead of second-place Australia while Denmark and Tunisia have so far collected one point each.
Source: Anadolu Agency