Justin Bieber BANNED from Miami Nightclubs -- They're Tired of His BS

Justin Bieber was persona non grata at the hottest nightclubs in Miami this past weekend -- they ALL refused to let Bieber inside ... because he's a bigger headache than he's worth.

Club sources tell TMZ, Bieber's people called ahead last week, asking to reserve tables at LIV, Story, and Adoré while the Biebs was in town -- but the singer's camp was denied at all 3 locations.

We're told Bieber's people begged and pleaded, promising to spend big money on bottles if the clubs granted Bieber entry, but the clubs didn't budge.

According to sources, there were 2 reasons for refusing Bieber -- first, he's not 21 ... second, the last time Bieber went big at a Miami nightclub he was arrested for DUI.

The DUI resulted in a ton of negative press for SET nightclub -- where Bieber had been partying prior -- and the guys at LIV, Story, and Adoré just didn't think Bieber was worth the trouble.

We're told the clubs offered to let Bieber in if he agreed to perform a song -- since performers don't have to meet the 21+ age requirement -- but Bieber turned them down. And no one cared.

Bieber ended up having a low key night Friday night at Cavalli Restaurant and Lounge. It's unclear where he landed Saturday night, but it was NOT at any of the big clubs.