Antonio Brown is officially walking away from football -- but only as a player -- because the newly retired NFL superstar just became part owner of a National Arena League team.
The former All-Pro receiver officially shut the door on his NFL career this week, according to ML Football ... and now, he's fully focused on his new role as part owner of the Albany Empire -- the same franchise his father, Eddie, played for back in the day.
TMZ Sports is told AB is 100% committed to his new position with the team .