Lena the PlugFiles for Divorce from Adam22

Lena the Plug is pulling the plug on her marriage with Adam22 ... TMZ has learned.

Lena filed the divorce docs in L.A. County without a lawyer on June 1 -- which happens to be her birthday -- and wants legal and physical custody of their 5-year-old daughter, according to divorce docs obtained by TMZ. 

For those who don't know ... the couple has a very successful podcast and OnlyFans account, which also makes for a very unique relationship -- they each shoot porn content with people outside their marriage, and interview those people on their pod.

That being said, in the docs, Lena says she does not have a job, and her only income is $3,000 monthly spousal support from Adam. She also says they have $1.1 million in community property assets, and she wants half of that in the divorce.

They got married back in 2023 and in the docs she lists their date of separation as April 15 ... tax day.

We've reached out to Lena and Adam, but no word back.