According to the lawsuit, Anton Tumanov claims he was the moving company driver that initially accused Brown in February 2020 of assaulting him during a violent encounter outside of the NFL star's mansion in Hollywood, Fla.

In the docs, Tumanov says he was hired to move some of Brown's belongings from California to Florida ... but he claims when he arrived at Brown's home on Feb. 11, the receiver snapped.

Tumanov says after a dispute over payment ... Brown and his trainer, Glenn Holt, beat the hell out of him, damaging his truck and other people's belongings in his truck in the process.

Tumanov reported the incident to police, and in his 911 call, you can hear he told dispatch he thought Brown was "high."

32-year-old Brown was eventually arrested and hit with 3 criminal charges for his alleged role in the incident ... though he later cut a deal with prosecutors in June 2020 to put the case behind him.

Brown agreed to probation and other stipulations, including community service hours and an anger management course, to have the case dropped.

According to Tumanov's suit, he's now suing Brown AND Holt for damages in excess of $30,000.

As we previously reported, Brown had appeared to have cleared up all of his legal issues in recent months, including settling a civil lawsuit with his rape accuser, Britney Taylor.