Floyd Mayweather had one of his entourage's vans burnt to a crisp in what appears to be an arson attack this weekend in the UK.

Floyd was speaking at an event inside the International Convention Centre in Birmingham Saturday night when 1 of his custom TMT vans was torched outside and left smoldering.

The boxer is currently on his "Undefeated" tour, where he's speaking in front of audiences and doing meet-and-greets with fans.
We've reached out to local authorities ... so far, no word back.

There's a silver lining for Floyd here -- he lost just 1 van ... as opposed to 4 expensive cars like the last time this happened.