Randy Travis -- I've Given Up Booze ... FOR GOOD!

Randy Travis is officially ON THE WAGON -- this according to his lawyer who tells TMZ the singer has “eliminated alcohol from his daily life.”

You know the history ... the troubled 53-year-old wound up behind bars several times in the past year after multiple booze-related arrests (naked DWI, public intoxication, assault).

Now, Randy's lawyer, Larry Friedman, tells TMZ … Travis has acknowledged the problem ... and decided to 86 the liquor from his life so he could focus on improving his health.

“[Randy] works out 3 hours every day and is in the best shape of his life,” Friedman says … adding, “He has a high protein diet and takes a lot of vitamins.”

Besides his new workout obsession, Friedman says Randy is determined to get his groove back – and hit up a recording studio in Texas last week to start laying down some new tracks.