Trina Braxton -- Husband Challenging Divorce On Grounds of Love

"Braxton Family Values" star Trina Braxton has an unusual problem -- the husband she wants to divorce has filed legal docs challenging her right to a divorce ... on grounds they allegedly still love each other.

We broke the story ... Toni Braxton's sister filed for divorce from Gabriel Adrian-Solis earlier this year, claiming their 10-year marriage was irretrievably broken ... after both of them admitted to cheating.

But Adrian-Solis doesn't believe the marriage is kaput ... he's filed docs in Georgia challenging the divorce petition ... claiming whatever's wrong with their relationship can be fixed.

According to the docs ... he wants a judicial declaration that a reconciliation is possible ... with a little work from both.