Tuchel was a free agent after leaving Borussia Dortmund a year ago, despite leading the team to victory in last season's German Cup.
This is unlikely to be a problem at Paris Saint-Germain, one of the richest clubs in the world.
"I hope to work with these great players, all of which are among the best on the planet".
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"I'm very happy to announce Thomas Tuchel as the new coach of Paris Saint-Germain", added PSG's wealthy Qatari owner Nasser Al Khelaifi. "With my staff, we will do everything to help the team push their limits to the highest global level", he enthused.
Emery won a domestic treble with PSG in 2017-18, but came under fire after failing to advance his side past the Champions League last-16 phase. There is an extraordinary potential in Paris and this is the most exciting challenge of my career. It is strongly imbued with the spectacular and efficient principles that have always nourished the strength of German football, especially on the worldwide scene.
"His competitive spirit, his preference for attacking play and his strong character are in line with what we have always wanted at Paris Saint-Germain, a style that the fans of our club have always demanded and admired".
The 44-year-old was appointed at Jurgen Klopp's successor at Dortmund in 2015 and won the DFB-Pokal last season, but left after falling out with the club hierarchy. In 2009, he enjoyed his first experience with a professional team when he took over as head coach of Mainz, and led this team for five years in the Bundesliga.