We may have just found the world's biggest Dwayne Johnson fan ... a man in Mexico absolutely lost it, breaking down in tears as "The Rock" signed his WWE belt, and it was super sweet.
It all went down this week during Johnson's #BlackAdamWorldTour ... where he was promoting his upcoming superhero film.
DJ shared the clip on Instagram ... showing fans in Mexico City eagerly waiting to meet the actor -- and one of 'em had a WWE belt for the former wrestler to sign.
Johnson LOVES his fans and was more than happy to autograph the belt ... and that's when the guy is overcome with emotions to the point he starts shaking and praying.
"Thank you! Thank you, Rock! Thank you," the fan says, giving DJ a handshake.
"An emotional night," Johnson wrote in the caption, "Lots of tears of joy."
"Even my cold, dark soul gets a little emotional when I see people start to break and cry. It's a beautiful thing. THANK YOU MEXICO I love you back."
This memorable moment comes just a week after a younger fan met with the 50-year-old after waiting 2 hours.
And, like in Mexico City, the young girl, Carol, cried while they took photos and video together."This awesome girl (Carol) waited two hours to finally meet BLACK ADAM⚡️," Johnson said, "His heart may be cold and black, but it still beats 🖤 Especially, for kids."
The movie comes out later this month ... in the meantime, let's get "The Rock" a Kleenex deal!