Label Won't Let Me Release New Song

Megan Thee Stallion claims her own record label is trying like hell to block the release of her newest song ... and she's running to a court for help.

According to new legal docs, obtained by TMZ, Meg claims her label, 1501 Certified Entertainment, and its honcho, former MLB star Carl Crawford, are doing everything they can to stop her from putting out a new song with BTS.

In the docs, MTS says she's the featured artist on a remix to the K-pop group's popular "Butter" track ... saying it's supposed to drop Friday, unless her label is able to block it.

Meg believes if released, "Butter" will help to expand her international fanbase, thanks to BTS' massive brand. She claims 1501 told her they…