Middleweight boxing champ Jermain Taylor saved Arkansas cops the trip -- turning himself in today for his SECOND gun-related arrest in just 3 days.
The 36-year-old Taylor was arrested Monday for felony assault after allegedly firing 2 shots during an altercation at an MLK Day parade. That bust violated the terms of his jail release for ANOTHER case ... where he is accused of shooting his cousin.
Cops say Taylor flagged down a Little Rock patrol car ... told cops his situation, and then he was hauled off to jail. Again.
Taylor, who's scheduled to fight in less than a month -- will be behind bars overnight. He's expected to have a bail hearing tomorrow over the violation.