Torban, 15, told Newsround how he was smuggled from his home country of Togo to Nigeria by traffickers.
The teenager described how he was made to work 12 hours a day in a field in difficult conditions.
He had hoped that by going to Nigeria with the traffickers he would be able to help his family by sending them extra money.
They are having a hard time because a drought meant there was little food and water.
He was desperate to go back home but the traffickers told him there was no money to send him home, so he had to stay working for them for eight months.
Torban's now back at school in Togo, after making his way back from Nigeria.
A drought in northern Togo means things are still difficult for his family.
But he's now warning his friends to stay away from the traffickers, as they are always looking for more children.
You can see more about the child slave trade in Newsround Extra on Monday 17 June.