Antonio Brown is being dragged to court yet again ... this time, a man in Florida claims the wideout sold him a bogus Richard Mille watch for $160K, fully knowing it was a phony worth far less.
Ryan Kane filed a lawsuit against Brown over it all in Broward County earlier this week ... alleging the NFL star ripped him off on the sale back on July 27.
In the suit, obtained by TMZ Sports, Kane says Brown assured him the watch -- allegedly an RM 011 model -- was real .