He says he's confident that she'll be cleared of all charges.
Stormy was released early on Thursday morning on a $6,000 bond.
Daniels, also known as Stephanie Clifford, is set for a Friday arraignment on three misdemeanor counts of touching a patron at a "sexually oriented" business in violation of an OH strip club law.
Daniels has alleged she had an affair with President Donald Trump in 2006 and that during his presidential campaign, she was paid $130,000 by Trump's attorney Michael Cohen to keep quiet about the tryst.
On Twitter, Avenatti said: 'My client Stormy Daniels was arrested in Columbus, Ohio, while performing the same act she has performed across the nation at almost a hundred clubs. "I deeply apologize to my fans in Columbus", Daniels said in a statement released by her attorney. My office was not involved in this sting operation, so any additional questions about it must be directed to the Columbus Division of Police. Avenatti promised to "vehemently contest all charges". She is facing three counts of "Illegally Operating Sexually Oriented Business - Employee Knowingly Touch Any Patron", according to online court records.
In what her lawyer dubbed a "politically motivated" set-up, Daniels was arrested without incident at the Sirens club in Columbus, Ohio after officers accused her of knowingly touching club patrons "in a specified anatomical area".
Michael Avenatti posted on Twitter early Thursday that Daniels will enter the not guilty plea to three misdemeanor charges. She was taken into custody during a Wednesday night show in Columbus, Ohio.
Avenatti said during the performance, some patrons touched her in a "non-sexual" way. Video showed her being marched into jail at 4.30am after allegedly grabbing an undercover officer's backside at the Sirens Gentleman's Club in Columbus.
Mr Avenatti wrote: "This was a setup & politically motivated".
A fourth officer, who was not touched, called for assistance to arrest Daniels and two others: Miranda Panda, of Marion, and Brittany Walters, of Pickerington.
A Columbus police spokeswoman didn't immediately respond to USA TODAY's request for comment.