The title gives Schumacher enough points to gain a super licence allowing him to compete in Formula One.
"It's a slightly unreal feeling, I'm absolutely delighted", Schumacher said.
That was trimmed to 39 points on Saturday morning after he finished 12th despite fighting his way up the field after a clash early in the race with his Prema teammate Marcus Armstrong saw both drivers head to the pits for repairs.
"Mick has the racing genes of Michael", said Gerhard Berger, boss of the German Touring Car championship.
Schumacher's success has generated huge interest in F3. And from next year, the Formula 3 will receive the status global, and Schumacher will be able to compete there.
Born in March 1999, the year before his father began a run of five consecutive F1 world titles for Ferrari, Mick started his racing career at the age of nine in karting.
His father suffered life-threatening injuries after a skiing accident in France in 2013 with Mick - who was only 14-years-old at the time -present.
The 49-year-old has not been seen in public since as he recovers at the family home in Switzerland.
In 2014, Mick junior finished the karting season second overall in the German, European and world championships.
With the spotlight permanently aimed at young Schumacher, he was fiercely guarded from reporters' questions by Sabine Kehm, his father's manager.
With few clear vacant seats for the 2019 season being available though, it is likely that Schumacher will progress to the Formula 2 series rather than jump straight into the premier class.