Operation Archimedes, the EU's biggest-ever coordinated crackdown on organised crime, has led to 1027 people arrested and 30 child trafficking victims being saved.
Liberal Democrat MEP Catherine Bearder said "This is tremendous work by a whole team of people, we should be very proud of the work they have done and very happy that vulnerable children are now safe tonight."
The operation, which was coordinated by the EU's law enforcement agency Europol, took place between 15 and 23 September 2014. It involved police forces from 24 countries working together and resulted in 170 people being arrested for trafficking in human beings.
Catherine, a longstanding campaigner against human-trafficking, added:
"Today's operation marks an incredible victory in the fight against the human-trafficking. This shows just what can be achieved when national police forces work closely together.
"But while we have won the battle, we have certainly not won the war. Human-traffickers will only be brought to justice and their victims will only be brought to safety if we continue to cooperate across borders."