UFC champ Henry Cejudo -- the guy who beat Demetrious Johnson -- says he's flattered Mark Wahlberg thinks his life story could be a movie ... and says he knows exactly who should play him!
MARIO LOPEZ!!
Cejudo's story is pretty amazing -- he grew up poor in South Central L.A. ... one of 7 children ... his drug-addicted father was deported and died when Henry was 20.
But he worked like hell to be one of the best wrestlers in the world -- and won a gold medal at the 2008 Beijing Summer Games when he was only 21.