Joe Haden's retired from the NFL, but he's still racking up wins ... TMZ Sports has learned he just scored a huge profit on the sale of his L.A. mansion.
The former Browns superstar bought the place for $4.3 million in 2016 -- but we're told he punted it just a few days ago for a whopping $6.5 mil.
It's unclear who the buyer was -- but we know Stephen Sweeney of The Beverly Hills Estates repped them .