Antonio Brown says he didn't freak out and throw furniture off his 14th story balcony back in April -- and now he's pointing the finger at another person who was with him that day.
TMZ Sports broke the story ... the Pittsburgh Steelers WR is being sued by a man who claims it was Brown who threw vases, an ottoman and other pieces out of his Miami apartment, nearly killing his 22-month-old son.
Cops were called to the scene -- and according to the police report, Brown was "very agitated" and yelling when they arrived.