She said: "This is a very important step forward in the fight to tackle bullying.
"For the seventh year in a row, bullying is the most common problem children bring to ChildLine.
"Last year we had 22,000 calls on this subject alone, this year it may be even more."
Already the government has held lots of conferences for headteachers about stopping bullying and around 4,000 schools have signed up to the anti-bullying charter.