Dwayne 'The Rock' Johnson Weeps During 15-Minute Standing Ovation

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Dwayne "The Rock" Johnson was practically a blubbering baby after debuting his new movie, "The Smashing Machine," at the Venice Film Festival ... where he got one hell of a reaction.

Check it out ... Dwayne and his costar, Emily Blunt, wipe away tears as the audience at the film festival showers the performers with love ... including a 15-minute standing ovation. Take it in!!!

While The Rock is no stranger to public affection -- he's dominated the box office many times over his career -- "The Smashing Machine" sets up the WWE star as a possible Oscars contender for this year's awards show.

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The buzz is already being compared to the reaction Brendan Fraser…