It said the operation took place on Thursday in the vast Sambisa forest—a militant hideout—in the northeast of the country.
It was not immediately clear if any of more than 200 girls abducted from a school in Chibok in April 2014 were among those freed.
Nearly 300 women and children were freed by the army earlier this week.
While the army says they had been captured by Boko Haram, a local senator says the women and children previously released may have been residents of the area.
In a tweet, the Nigerian military wrote: “FLASH: Another set of 234 women and children were rescued through the Kawuri and Konduga end of the #Sambisa Forest on Thursday.”
It said the freed hostages were being screened to establish their identities.
The military earlier said it had destroyed 13 camps belonging to the Islamist insurgents in the Sambisa forest, which surrounds a reserve in Borno.
Read the full story at bbc.com