Afrojack Falls Off Stage -- I Face-Planted Pon De Floor

Afrojack dropped a sick banger Wednesday in Miami ... and by that, we mean he fell off stage and banged his head on concrete.

Afro got a little too turnt up while spraying people with champagne at the Dim Mak Beach Party alongside Steve Aoki ... and fell into the crowd face first.

Bad month to be a DJ -- first Tiesto's hospitalized after hitting his head on a giant LED ... now Afrojack is falling off the stage.

Afrojack tells TMZ, "You know what you do. When you fall off the horse, you get back on!!'