The France striker, 25, opened the scoring in the 16th minute and added another just before half-time to become PSG’s all-time top scorer in the cup.
A Marco Asensio strike and Revel own goal put PSG 4-0 up at the break.
Mbappe then completed his hat-trick in the 48th minute, with further goals from Goncalo Ramos, 19-year-old Cher Ndour and two from Randal Kolo Muani.
France captain Mbappe, who is PSG’s record goalscorer, now has 30 goals in 22 games in the French Cup.
The game was played at Stade Pierre-Fabre in Castres, as Revel’s stadium, around 20 miles away in the Haute-Garonne south-western region only has capacity for 2,000 fans.
(BBC)
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